WO2019130605A1

WO2019130605A1 - Hood latch device

Info

Publication number: WO2019130605A1
Application number: PCT/JP2018/008202
Authority: WO
Inventors: 昇小河瀬; 俊久西條; 友和伊藤
Original assignee: 三井金属アクト株式会社
Priority date: 2017-12-27
Filing date: 2018-03-05
Publication date: 2019-07-04
Also published as: CN111527277B; JP2019116798A; JP6891384B2; CN111527277A

Abstract

A hood latch device for engaging with a striker mounted on a hood and closing the hood, said hood latch device comprising: a main latch that is mounted on a vehicle body and that engages with a striker by rotating from an unlatched position to a latched position around a latch shaft; a ratchet that holds the main latch in the latched position by engaging with the main latch that has rotated from the unlatched position to the latched position; a latch spring that has a coil part, a first leg extending from a first end of the coil part, and a second leg extending from a second end of the coil part; and an anti-rattle latch that can rotate around the latch shaft and that presses the striker engaged with the main latch in the unlatching direction by way of being biased by the latch spring. The center of the coil part is eccentric with respect to the shaft axis of the latch shaft.

Description

Bonnet latch device

The present application is based on Japanese Patent Application No. 2017-251848, which is a Japanese application whose filing date is December 27, 2017, and claims priority based on the same application. This application is incorporated by reference in its entirety into the present application.

The present invention relates to a latch device for a bonnet roof (engine roof), ie, a bonnet latch device. In particular, the present invention relates to a bonnet latch device having an improved latch spring that lifts up the bonnet roof.

A conventional bonnet latch device includes a striker attached to a bonnet hood and a latch unit attached to a vehicle body and engaged with the striker. The latch unit holds the latch in the latch position by engaging the latch that rotates from the unlatched position to the latched position against the biasing force of the latch spring due to the abutting engagement with the striker, and the latch rotated to the latched position And a ratchet. The latch spring rotates the latch in the unlatch direction when the latch is released from the ratchet along with the opening operation of the bonnet hood, and strong spring torque that can push the bonnet hood from the closed position (latch position) to the lift up position by 2 cm to 3 cm. have.
Further, in Patent Document 1, a bonnet latch in which a pressing lever (anti-rat lever) for pressing a striker engaged with a latch in an unlatching direction by a spring biasing force to press the striker against the latch is coaxially locked with the latch. An apparatus is disclosed. In this bonnet latch device, by pressing the striker against the latch, the gap between the two is eliminated and the rattle noise generated between the striker and the latch is suppressed.

Japanese Patent Application Laid-Open No. 2-232487

The spring torque of the latch spring of the conventional bonnet latch device is set based on the strength with which the bonnet hood can be reliably lifted up. Therefore, in the conventional bonnet latch device, when changing the hood hood from the open state to the closed state, the resistance by the spring torque tends to be too strong, and there is a problem that the closing operability is impaired.

A bonnet latch device according to a first aspect of the present invention is a bonnet latch device which engages with a striker attached to a bonnet hood to close the hood hood, wherein the bonnet latch device is attached to a vehicle body and from an unlatched position centered on a latch shaft A main latch that rotates to a latch position and engages with the striker; a ratchet that engages with the main latch that is rotated from the unlatched position to the latch position; and holds the main latch at the latch position; A latch spring having a first leg extending from a first end of the coil portion and a second leg extending from a second end of the coil portion, and rotatable about the latch shaft, biased against the latch spring Anti-latch to push the striker engaged with the main latch. Comprising a Toruratchi, the center of the coil portion is eccentric with the axis of the latch shaft.
A bonnet latch device according to a second aspect of the present invention is the bonnet latch device according to the first aspect, further comprising a base plate having a side wall, the anti-ratle latch provided with a bending piece, and the first leg Is abutted against the side wall, the second leg is locked to the anti-latral latch, and the coil portion is locked to the bending piece, so that the center of the coil portion is the latch shaft. It is eccentric to the shaft core.
A bonnet latch device according to a third aspect of the present invention is the bonnet latch device according to the second aspect, wherein the first leg portion is provided with a bent portion abutting on the side wall, and the anti rattle latch in the latch direction With rotation, the bent portion moves upward while sliding on the side wall.
A bonnet latch device according to a fourth aspect of the present invention is the bonnet latch device according to the second aspect or the third aspect, wherein the base plate further has an inclined surface, and the inclined surface extends to the side wall.
In the bonnet latch device according to the fifth aspect of the present invention, in any one of the bonnet latch devices according to the first to fourth aspects, the anti rattle latch is fixed to the latch shaft by pivoting. And the latch shaft is rotatable.
A bonnet latch device according to a sixth aspect of the present invention is the bonnet latch device according to the fifth aspect, wherein the main latch and the anti rattle latch are disposed so as to overlap each other in the axial direction of the latch shaft.
A bonnet latch device according to a seventh aspect of the present invention is the bonnet latch device according to the fifth aspect or the sixth aspect, wherein the anti rattle latch is engageable with the striker together with the main latch, The main latch and the anti rattle latch rotate in conjunction with each other with a predetermined play in the rotational direction of the main latch and the anti rattle latch.
In the bonnet latch device according to the eighth aspect of the present invention, in any one of the bonnet latch devices according to the first to seventh aspects, the anti rattle latch has U-shaped opposing walls facing each other. An anti-latched latch holding portion is provided which is a groove surrounded and engaged with the striker to hold the striker, and one wall of the opposite wall abuts against the striker to move the striker in the unlatch direction. The other wall of the opposing wall is a regulating wall which regulates the movement of the striker in the direction of the unlatch.
The bonnet latch device according to a ninth aspect of the present invention is the bonnet latch device according to the eighth aspect, wherein the anti rattle latch is pivotally supported by the latch shaft, and the main latches face each other in a U shape. A holding portion for main latch is provided which is a groove surrounded by an opposing wall and engaged with the striker to hold the striker, and an upper portion of the holding portion for the main latch in the main latch is a portion of the latch shaft. In the axial direction, it overlaps with the upper portion of the holding portion for the anti-latched latch in the anti-latched latch.
In a bonnet latch device according to a tenth aspect of the present invention, in any one of the bonnet latch devices according to the first aspect to the ninth aspect, the anti rattle latch includes axial directions of the ratchet and the latch shaft. There is a ratchet restraint that overlaps at.

In the bonnet latch device according to the first to third aspects of the present invention, the spring torque necessary for lifting up the bonnet hood is obtained by causing the center X of the coil portion 24a to be eccentric with respect to the rotation axis of the anti rattle latch 22. When the hood hood is closed from the unlatched state to the latched state while maintaining the above, the biasing force of the second latch spring 24 can be reduced, and the closing operability of the hood hood can be improved.
The bonnet latch device according to the third aspect of the present invention can improve the assembling workability of the torsion coil spring including the coil portion and the first leg and the second leg extending from the coil portion.
In the bonnet latch device according to the fifth and sixth aspects of the present invention, the anti-lattice latch can totally reinforce the front side of the main latch by pivoting the main latch and the anti-lattice latch with the same shaft.
In the bonnet latch device according to the seventh aspect of the present invention, the anti rattle latch is interlocked with the main latch, so that the anti rattle latch can be used as a reinforcing member for the main latch.
In the bonnet latch device according to the eighth aspect of the present invention, the engagement portion between the main latch and the striker can be reinforced by the anti rattle latch.
In the bonnet latch device according to the ninth aspect of the present invention, deformation in the axial direction of the latch shaft of the main latch can be suppressed by the anti rattle latch.
The bonnet latch device according to the tenth aspect of the present invention can suppress displacement deformation of the ratchet in the axial direction of the ratchet shaft by the anti rattle latch.

The above, and other objects, features and advantages of the present application will become apparent from the following detailed description with reference to the accompanying drawings which illustrate the present application.

It is a front view of the door open state of a bonnet latch device. It is a rear view of the bonnet latch device which omitted the member by the side of the front. It is a front view of a latch body and a ratchet of a closed door state. It is a front view of the main latch of a bonnet latch device. It is a front view of the anti rattle latch of a bonnet latch device. It is a front view of the ratchet of a bonnet latch device, and a control lever. Fig. 6 is a schematic diagram showing the play between the main latch and the anti-latral latch. It is a schematic diagram which shows the gap | interval between the striker holding part and striker of a main latch and an anti-rattle latch. It is a schematic diagram which shows a motion of the torsion coil spring of a closed door state. It is a schematic diagram which shows a motion of the torsion coil spring in an open state (lift up state). It is a perspective view which shows the inclined surface of a baseplate.

An embodiment of the present invention will be described based on the drawings. FIG. 1 shows a front view of a bonnet latch device 10 of the present embodiment. In many vehicles, the engine room is located on the front side inside the vehicle cabin, and a typical hood hood (not shown) covering the engine room is anchored at the rear end (proximal end) to the vehicle body by hinges etc. . The bonnet latch device 10 includes a latch unit 11 fixed to the front end of the vehicle body and a striker 12 fixed to the front end (rotational end) of the hood hood.

As shown in FIGS. 1 and 2, the latch unit 11 includes a metal base plate 13. Rectangular mounting holes 14 are formed on the left and right sides of the base plate 13. The

mounting holes

14, 14 are formed sufficiently larger than the shaft diameters of the

bolts

15, 15 inserted respectively, and the mounting position of the latch unit 11 is finely adjusted using the play between them.

At the upper center of the base plate 13 is formed a striker groove 16 along the longitudinal direction with the upper end opened. As shown in FIG. 1, the latch body 18 is axially fixed by the latch shaft 17 on the left side of the base plate 13 with the striker groove 16 interposed therebetween, and the ratchet 20 is axially fixed on the right side of the base plate 13 by the ratchet shaft 19. The axial center of the latch shaft 17 and the axial center of the ratchet shaft 19 are set parallel to each other.

The latch body 18 includes a main latch 21 (FIG. 4) and an anti-latral latch 22 (FIG. 5). The main latch 21 and the anti rattle latch 22 are arranged to overlap each other in the axial direction of the latch shaft 17. The main latch 21 and the anti rattle latch 22 rotate substantially interlockingly with each other, and are biased in the counterclockwise direction (unlatched direction) by the biasing force of the first latch spring 23 and the second latch spring 24. The ratchet 20 is biased in the latch engagement direction (clockwise direction) by the biasing force of the ratchet spring 25.

FIG. 1 shows the door open state (unlatched state) of the bonnet latch device 10. When the hood hood is closed, the striker 12 moves downward, enters into the striker groove 16 and abuts and engages the latch body 18. By this series of operations, the latch body 18 rotates in the latch direction (clockwise direction) against the biasing force of the first latch spring 23 and the second latch spring 24.
Then, when the latch body 18 reaches the latch position, the ratchet 20 engages with the latch body 18 by the biasing force of the ratchet spring 25 and maintains the closed state of the bonnet hood (striker 12). The sub-latch 26 in FIG. 1 is shown on the moving path of the striker 12, and is pushed out to the side by contact with the striker 12, as described later. Therefore, the sub latch 26 does not prevent the downward movement of the striker 12.

The main latch 21 and the anti-latral latch 22 are both fixed to the latch shaft 17. In the present embodiment, the main latch 21 is disposed between the base plate 13 and the anti-latral latch 22.

A recess or opening 21a is formed in the main latch 21, and a protrusion 22a which protrudes into the opening 21a is formed in the anti-latral latch 22 (see FIG. 7 and the like). The opening 21 a is larger than the protrusion 22 a in the rotational direction (circumferential direction) about the latch shaft 17. As shown in FIG. 7, a circumferential play 27 is set between the opening 21a and the protrusion 22a. Due to this setting, the main latch 21 and the anti-latral latch 22 are coupled to rotate in conjunction with each other with the circumferential direction clearance 27. The play 27 is used to reduce rattling noise generated between the main latch 21 and the striker 12. The reduction of rattle noise will be described later.

As shown in FIGS. 1, 3, 8, etc., the main latch 21 is formed with an engagement groove 21 b that engages with the striker 12, and the anti-latral latch 22 is formed with an engagement groove 22 b that engages with the striker 12. It is formed. The engaging groove 21 b and the engaging groove 22 b are shaped similar to each other, and extend in the radial direction of the latch shaft 17. On the back side of the engaging groove 21b and the engaging groove 22b and in the part close to the latch shaft 17, the both side walls (opposing walls) have a U shape substantially parallel to each other and are surrounded by opposing walls opposing each other The

striker holding portions

21c and 22c are formed as grooves. As shown in FIG. 3, in the closed state, the striker 12 engages with the

striker holding portions

21 c and 22 c on the back side. Here, the striker holding portion 21c is an example of a holding portion for a main latch, and the striker holding portion 22c is an example of a holding portion for an anti-latral latch.

In the bonnet latch device 10, the

striker holding portions

21c and 22c are formed to be wider than the diameter of the striker 12 by about 0.5 mm to 1 mm, and a gap 28 is formed therebetween. The gap 28 is required to allow the striker 12 to smoothly enter and engage with the

striker holding portions

21 c and 22 c of the metal main latch 21 and the anti-latral latch 22.

In the portions of the engagement groove 21b and the engagement groove 22b apart from the latch shaft 17, the

openings

21d and 22d are formed to flare.

The main latch 21 is disposed on the same plane as the ratchet 20. On the side wall of the opening 21d of the main latch 21, an abutment surface 21e with which the claw 20a of the ratchet 20 is engaged is formed. The anti rattle latch 22 is formed with a ratchet restraining 22 e extending laterally from the latch shaft 17. The ratchet restraining 22 e extends to a position overlapping the ratchet 20 in the axial direction of the ratchet shaft 19. The ratchet retainer 22e overlaps the ratchet 20 at least in the closed state shown in FIG. 3, and preferably overlaps the ratchet 20 also in the opened state shown in FIG.

The main latch 21 is disposed on the same plane as the ratchet 20. On the other hand, the anti-latral latch 22 is disposed on a rotation plane different from that of the ratchet 20 and does not engage with the ratchet 20.

When deformation or the like occurs in the bonnet hood or the base plate 13, an external force along the axial center direction of the ratchet shaft 19 may act on the ratchet 20. The external force in this direction acts as an external force for separating the claw 20a of the ratchet 20 from the contact surface 21e of the main latch 21. However, the front side of the ratchet 20 is protected and reinforced because the ratchet restraining 22e of the anti-latral latch 22 is disposed on the front side of the ratchet 20 so as to overlap in the axial direction of the ratchet shaft 19. Therefore, the engaged state between the claw 20a of the ratchet 20 and the contact surface 21e of the main latch 21 can be maintained well. The back side of the ratchet 20 is protected and reinforced by the base plate 13.

The first latch spring 23 is preferably a cylindrical coil spring that is locked between the anti-latral latch 22 of the latch body 18 and the base plate 13. The biasing force of the first latch spring 23 is transmitted to the main latch 21 through the contact between the protrusion 22a and the opening 21a.

The second latch spring 24 is preferably a torsion coil spring provided with a coil portion 24a, a first leg portion 24b and a second leg portion 24c. In the present embodiment, the front end side of the first leg 24 b is in contact with the side wall 13 a of the base plate 13, and the front end of the second leg 24 c is locked in the locking hole 22 f of the anti-lattice latch 22. Then, as in the case of the first latch spring 23, the second latch spring 24 transmits the biasing force to the main latch 21 through the contact between the protrusion 22a and the opening 21a.

In the closed state shown in FIG. 3, the pawl 20 a of the ratchet 20 abuts on the contact surface 21 e of the main latch 21 to hold the main latch 21 at the latch position. Also, the ratchet 20 does not engage with the anti-ratchet latch 22 located on a different plane of rotation. Therefore, the anti-latral latch 22 can be independently rotated in the unlatch direction (counterclockwise direction) by the biasing force of the first latch spring 23 and the second latch spring 24 by the amount of the clearance 27 set between itself and the main latch 21. It becomes. A pressing wall 22g on the lower side of the striker holding portion 22c of the anti-rotation latch 22 which has been independently rotated abuts on the lower surface of the striker 12, and presses the striker 12 in the opening direction. The striker 12 is brought into pressure contact with the engaging wall 21 f on the upper side of the striker holding portion 21 c of the main latch 21 by the movement of the anti-ratch latch 22, and is held between the engaging wall 21 f and the pressing wall 22 g by a spring biasing force. Be done. Therefore, the gap 28 of about 0.5 mm to 1 mm set between the

striker holding parts

21c and 22c and the striker 12 is eliminated (or narrowed). As a result, rattle noise that is the source of the gap 28 is effectively suppressed.

In the closed state shown in FIG. 3, when the striker 12 is pulled up extremely strongly in the opening direction, the engagement groove 21b (the engagement wall 21f) of the main latch 21 may be deformed and damaged, and the bonnet may be opened. . Therefore, in the present embodiment, a function of improving the latch strength is added to the anti rattle latch 22 which has a function of suppressing rattle noise and a function of suppressing displacement of the ratchet 20 in the axial direction. Specifically, the striker holding portion 22c is formed in a U shape, and the upper side wall (one of the opposing walls) of the reinforcement wall 22h (the restriction wall) with respect to the engagement groove 21b (the engagement wall 21f) of the main latch 21 is formed. One example).

In FIG. 3 showing the closed state, the reinforcing wall 22h is offset with respect to the engaging wall 21f by an amount corresponding to the play 27 and is not arranged flush with the engaging wall 21f. However, if the engagement wall 21 f is temporarily deformed, the reinforcement wall 22 h immediately contacts the striker 12 to maintain the closed state, so that a sufficient reinforcement effect can be expected from the reinforcement wall 22 h.

The anti rattle latch 22 is pivotally supported by the same latch shaft 17 as the main latch 21, and is disposed so as to cover the front side of the main latch 21. Therefore, the anti rattle latch 22 also functions as a reinforcing member that suppresses the deformation of the main latch 21 in the axial direction of the latch shaft 17. In the present embodiment, the reinforcing wall 22h of the anti-latral latch 22 is formed on the upper structural body 21g constituting the engaging wall 21f of the main latch 21 and the lower structural body 21h constituting the abutting surface 21e of the main latch 21. The upper structural body 22k constituting the second embodiment and the lower structural body 22m constituting the pressing wall 22g of the anti-latral latch 22 respectively face the front side. That is, the upper portion of the striker holding portion 21 c in the main latch 21 overlaps the upper portion of the striker holding portion 22 c in the anti-latral latch 22 in the axial center direction of the latch shaft 17. Therefore, the anti-latral latch 22 can well suppress the deformation of the main latch 21 in the axial direction of the latch shaft 17.

The ratchet 20 is preferably connected to the operating lever 29 in the vehicle compartment via a connecting wire 30 (see FIG. 6). When the ratchet 20 is counterclockwise rotated by the operation lever 29, in FIG. 3, the claw 20a is separated from the contact surface 21e of the main latch 21, and the latch 18 is unlatched by the biasing force of the first latch spring 23 and the second latch spring 24. Rotates counterclockwise. At this time, since the rotational force of the latch body 18 in the unlatch direction is in principle proportional to the strength of the biasing force of the first latch spring 23 and the second latch spring 24, the spring elasticity is strong according to the weight of the bonnet roof, etc. Is adjusted.

The minimum urging force required for the first latch spring 23 and the second latch spring 24 is an urging force for reliably lifting the bonnet roof to the lift-up position by unlatch rotation of the latch body 18. The lift-up position is a position where a gap can be formed between the bonnet roof and the vehicle body so that a driver or a mechanic can insert a hand. Typically, the size of the gap is about 2 cm to 3 cm.

As shown in FIG. 2, the sub latch 26 is fixed to the back side of the base plate 13 by a shaft 31. In this case, the sub latch 26 is biased in the clockwise direction by the spring 32 in FIG. 2 and in the counterclockwise direction by the spring 32 in FIG. At the tip of the arm 33 extending upward of the sub latch 26, an inclined surface 34 is formed which can be in contact with the striker 12 moving in the closing direction. In FIG. 1, when the striker 12 is moved downward by the closing door, the striker 12 abuts on the inclined surface 34 to rotate the sub latch 26 clockwise. Therefore, the downward movement of the striker 12 is not blocked.

The sub latch 26 is provided with an open lever 35, which can be accessed when a driver or a mechanic inserts a hand, between the lifted-up bonnet roof and the vehicle body.

When the claw 20a of the ratchet 20 is separated from the contact surface 21e of the main latch 21 by the operation of the operation lever 29, the striker 12 (bonnet roof) is unlatched and rotated by the biasing force of the first latch spring 23 and the second latch spring 24. To lift and move to the lift up position. The striker 12 is in a state of being fully pushed up by the latch body 18 in the lift-up state, but is positioned lower than the hook 36 formed on the arm 33 of the sub latch 26. Also, the movement of the sublatch 26 is independent of the movement of the ratchet 20. Therefore, for example, even if the ratchet 20 is disengaged from the latch body 18 due to a traveling accident, the hooks 36 of the sub latch 26 can reliably capture the striker 12 and prevent the hood roof from being opened.

In order to fully open the bonnet roof at the lift-up position, the sub latch 26 may be rotated by the open lever 35 and the hook 36 may be removed from the upward movement trajectory of the striker 12.

As shown in FIG. 1, a latch switch 37 is disposed in the vicinity of the lower side of the latch body 18. The latch switch 37 detects whether the bonnet roof is in the closed state or the open state (lift up state) according to the rotational position of the latch body 18.

As shown in FIGS. 9 and 10, the coil portion 24a of the second latch spring 24 made of a torsion coil spring is locked to the spring locking bent piece 22j (an example of a bent piece) of the anti-latral latch 22. The spring engagement bending piece 22 j is separated from the latch shaft 17 by a predetermined distance. In this case, the center X of the coil portion 24 a locked to the spring locking bent piece 22 j is eccentric to the axial center of the latch shaft 17.

As shown in FIGS. 9 and 10, the first leg 24b is formed with a bent portion 24d that is in contact with the side wall 13a of the base plate 13. When the anti-latral latch 22 is displaced from one position of the latch position (FIG. 9) and the unlatched position (FIG. 10) to the other position, the bending portion 24d moves in sliding contact with the side wall 13a.

As shown in FIG. 1, the mounting holes 14 are formed in fastening surfaces 13 c which are bulged rearward on both sides of the base plate 13. The fastening surface 13 c is substantially parallel to the rotational surface of the latch body 18. A longitudinal side wall 13a with which the first leg 24b abuts is formed on the side surface of the fastening surface 13c from the inside (see FIG. 11).

In order to assemble the second latch spring 24 to the latch unit 11, the assembler first locks the end of the second leg 24 c to the locking hole 22 f of the anti-latched latch 22, and the coil portion 24 a is engaged with the anti-latched latch 22. The spring lock bent piece 22j is locked.
The first leg 24b in a state of being largely opened with respect to the second leg 24c may be brought into contact with the lateral upper wall 13d formed on the upper portion of the fastening surface 13c of the base plate 13 or may face each other. It will not. An inclined surface 13 b is formed between the upper wall 13 d and the fastening surface 13 c of the base plate 13. The inclined surface 13b is gradually inclined rearward from the upper wall 13d toward the fastening surface 13c.
The assembler moves the first leg 24b brought into contact with the upper wall 13d backward so that the contact with the upper wall 13d is released, and then stops the first leg 24b using the inclined surface 13b. The first leg 24b is further flexed to be locked to the side wall 13a on the side of the fastening surface 13c.
As described above, the first leg portion 24 b can smoothly get over the fastening surface 13 c protruding rearward and be locked to the side wall 13 a.

The anti rattle latch 22 is rotated and displaced by an angle A between the latch position (see FIGS. 3 and 9) and the unlatched position (see FIGS. 1 and 10). As described above, the center X of the coil portion 24 a is eccentric to the axial center of the latch shaft 17. Therefore, the coil portion 24 a moves in an arc shape so as to revolve around the axial center of the latch shaft 17 with the rotation of the anti-latral latch 22. The amount of torsion of the second latch spring 24 is a line connecting the contact point between the first leg 24b and the side wall 13a and the center X of the coil 24a, and the end (locking hole 22f) of the second leg 24c. It is determined by a twisting angle B formed by a line segment connecting the center X of the coil portion 24a (see FIGS. 9 and 10).

When the anti rattle latch 22 is rotated from the unlatched position (see FIG. 10) to the latched position (see FIG. 9), the coil portion 24 a moves while revolving around the axis of the latch shaft 17, so the coil portion 24 a has side walls 13 a. Keep away from Therefore, the first leg 24b in contact with the side wall 13a is not twisted relative to the coil 24a because the coil 24a is farther from the side wall 13a. As a result, the twisting angle B of the second latch spring 24 in the case of the present embodiment can be made smaller than in the non-eccentric case where the center X of the coil portion 24 a matches the axis of the latch shaft 17.

When the anti-latral latch 22 is rotated from the unlatched position (see FIG. 10) to the latched position (see FIG. 9), the first leg 24b is twisted relative to the coil 24a. Therefore, the biasing force of the second latch spring 24 increases in proportion to the twisting angle B. As a result, when the coil portion 24 a is eccentric to the latch shaft 17 as in the case of the present embodiment, compared with the case where the coil portion 24 a is not eccentric to the latch shaft 17, the anti rattle latch 22 is Can reduce the twisting angle B of the second latch spring 24 when it rotates from the unlatched position to the latched position.

With the above configuration, compared to the case where the coil portion 24a is made non-decentered with respect to the axial center of the latch shaft 17, the present embodiment performs the biasing force of the second latch spring 24 in the unlatched state in the latched state under the same conditions. The biasing force of the second latch spring 24 can be weakened.
Therefore, the bonnet latch device 10 of the present embodiment can weaken the biasing force of the second latch spring 24 when closing the door from the unlatched state to the latched state while securing the spring torque for lifting up the bonnet roof. Accordingly, the bonnet latch device 10 of the present embodiment can improve the closing operability of the bonnet roof.

Further, as described above, with the rotation of the anti-latral latch 22, the bent portion 24d of the first leg 24b moves upward while sliding on the side wall 13a of the base plate 13. Specifically, as the anti-latral latch 22 rotates from the unlatched position (see FIG. 10) to the latched position (see FIG. 9), the bent portion 24d moves upward while slidingly contacting the side wall 13a. As a result, in the present embodiment, the twisting angle B of the second latch spring 24 can be made smaller than in the case where the bending portion 24 d can not move upward with the rotation of the anti-latral latch 22.
The movement distance of the bending portion 24d due to the rotation of the anti-latral latch 22 is increased by causing the coil portion 24a to be more eccentric to the latch shaft 17. Therefore, by setting the eccentricity of the coil portion 24 a with respect to the latch shaft 17 larger, the twisting angle B of the second latch spring 24 can be made smaller. Along with this, the lift up torque can be secured, and the closing operability of the bonnet roof can be further improved.

Since the bonnet latch device 10 is substantially exposed, it is susceptible to salt damage (antifreeze) and the like. Therefore, in addition to the latch body 18 and the ratchet 20, sufficient anti-corrosion measures are desired for the sub latch 26 and the base plate 13 which are disposed particularly on the front side of the vehicle.
Conventionally, as the above-mentioned anti-corrosion measures, the sublatch 26 and the base plate 13 etc. are subjected to the zinc plating film treatment of the undercoat film, the trivalent chromate film treatment, and the cationic electrodeposition coating treatment of the coating film in this order. The However, since the cationic electrodeposition coating film is superior to the trivalent chromate film in adhesion to the zinc phosphate film, it prevents the zinc plating film of the base film, the zinc phosphate film, and the cationic electrodeposition coating film of the coating film. It is desirable to apply a rust surface treatment.

Reference Signs List 10 bonnet latch device 11 latch unit 12 striker 13 base plate 13a side wall 13b inclined surface 13c attachment surface 13d upper wall 14 attachment hole 15 bolt 16 striker groove 17 latch shaft 18 latch body 19 ratchet shaft 20 ratchet 20a claw 21 main latch 21a opening 21b engaging groove 21c striker holding portion (an example of holding portion for main latch)

21d front opening

21e contact surface

21f engagement wall 21g upper structure 21h lower structure 22 anti rattle latch 22a protrusion 22b engagement groove 22c striker holding portion (example of holding portion for anti rattle latch)
22d Front 22e Ratchet restraining 22f Locking hole 22g Pressing wall 22h Reinforcement wall (an example of restriction wall)
22j Spring locking bent piece (an example of bent wall)
22k upper structure 22m lower structure 23 first latch spring 24 second latch spring 24a coil portion 24b first leg portion 24c second leg portion 24d second bent portion 25 ratchet spring 26 sublatch 27 play 28 gap 29 operation lever 30 connecting wire 31 shaft 32 Spring 33 Arm 34 Ramp 35 Open Lever 36 Hook 37 Latch Switch X Center

Claims

A bonnet latch device which engages with a striker attached to a bonnet hood to close the hood hood,
A main latch attached to the vehicle body and rotated from an unlatched position to a latched position about the latch shaft to engage with the striker;
A ratchet which engages with the main latch rotated from the unlatched position to the latched position to hold the main latch in the latched position;
A latch spring having a coil portion, a first leg extending from a first end of the coil portion, and a second leg extending from a second end of the coil portion;
An anti rattle latch which is rotatable about the latch shaft and biased by the latch spring to press the striker engaged with the main latch in an unlatched direction;
Equipped with
The center of the coil portion is eccentric to the axial center of the latch shaft,
Bonnet latch device.
Further comprising a base plate having side walls,
The anti rattle latch is provided with a bending piece,
The first leg is brought into contact with the side wall, the second leg is engaged with the anti-latral latch, and the coil is engaged with the bending piece, whereby The center is eccentric to the axis of the latch shaft,
The bonnet latch device according to claim 1.
The first leg is provided with a bent portion that contacts the side wall,
The bent portion moves upward while slidingly contacting the side wall with the rotation of the anti-rattle latch in the latch direction.
The bonnet latch device according to claim 2.
The base plate further has an inclined surface,
The inclined surface extends to the side wall,
The bonnet latch device according to claim 2 or 3.
The anti rattle latch can be rotated about the latch shaft by being fixed to the latch shaft.
The bonnet latch device according to any one of claims 1 to 4.
The main latch and the anti rattle latch are disposed so as to overlap with each other in the axial direction of the latch shaft.
The bonnet latch device according to claim 5.
The anti rattle latch can be engaged with the striker together with the main latch,
The main latch and the anti rattle latch rotate in conjunction with each other with a predetermined play in the rotational direction of the main latch and the anti rattle latch.
The bonnet latch device according to claim 5 or 6.
The anti rattle latch is a U-shaped groove surrounded by opposing walls facing each other, and is provided with a holder for the anti rattle latch for engaging with the striker to hold the striker.
One of the opposing walls is a pressing wall that contacts the striker to press the striker in the unlatching direction, and the other wall of the opposing wall is a regulating wall that restricts movement of the striker in the unlatching direction It is assumed that
The bonnet latch device according to any one of claims 1 to 7.
The anti rattle latch is fixed to the latch shaft,
The main latch is a U-shaped groove surrounded by opposing walls facing each other, and is provided with a main latch holding portion for holding the striker in engagement with the striker.
An upper portion of the main latch holding portion in the main latch is overlapped with an upper portion of the anti rattle holding portion in the anti rattle latch in an axial direction of the latch shaft.
The bonnet latch device according to claim 8.
The anti rattle latch is provided with a ratchet restraining that overlaps in the axial direction of the ratchet and the latch shaft.
The bonnet latch device according to any one of claims 1 to 9.