JPH06227435A - Front part car body structure of automobile - Google Patents

Abstract

PURPOSE:To effectively reduce the steering vibration by permitting the installation of a dynamic damper over a wide range. CONSTITUTION:A vibration absorbing means 41 which elastically supports a hood and absorbs the car body vibration by the mass of the hood is installed on a locking device 4 which engages the hood with a shroud upper 3 simultaneously with the closing of the hood. The locking device 4 is constituted of a striker 12 installed on the hood and a latch base member 13 installed on the shroud upper 3, and the vibration absorbing means 41 is formed from an elastic member 42a which is attached in a cylindrical form on the periphery of the center part of the striker 12 and can be elastically deformed between the center part of the srriker 12 and in the longitudinal groove 14 of the latch base member 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front vehicle body structure of an automobile, and more particularly to a measure for effectively absorbing vehicle body vibration before transmission to a steering wheel.

[0002]

2. Description of the Related Art Generally, in a front vehicle body structure of an automobile, for example, as disclosed in Japanese Patent Laid-Open No. 61-5185, a bonnet rotatably supported by the vehicle body is provided when the hood is closed. It is known that a bonnet lock device is provided as an engaging portion that engages with.

[0003]

By the way, the vehicle body vibration generated during traveling is amplified from each part of the vehicle body through the bonnet or the like, and is transmitted through the steering wheel as steering vibration which is uncomfortable for the driver. There is.

In that case, it is desired to suppress the vehicle body vibration by using a dynamic damper or the like before it is transmitted as steering vibration to the steering wheel, but since the vibration system path extends over a wide range, the installation location of the dynamic damper cannot be specified. However, the vehicle body vibration was inevitably transmitted as steering vibration.

The present invention has been made in view of the above circumstances, and an object thereof is to enable installation of a dynamic damper over a wide range and effectively reduce steering vibration.

[0006]

In order to achieve the above-mentioned object, a solution means provided by the invention according to claim 1 is to engage a bonnet with respect to a vehicle body when the bonnet rotatably supported by the vehicle body is closed. It is premised on the front body structure of an automobile provided with an engaging portion to be fitted. The engaging portion is provided with vibration absorbing means for elastically supporting the bonnet with respect to the vehicle body and absorbing vehicle body vibration by the mass of the bonnet.

Further, the solution means taken by the invention of claim 2 specifies the engaging portion and the vibration absorbing means of the invention of claim 1, and the engaging portion is one of a bonnet and a vehicle body. A striker provided on one side and a lock member that is provided on the other one of the vehicle body and the bonnet and engages the striker detachably.
The vibration absorbing means is provided around the striker and is formed of an elastic material that is elastically deformable between the striker and the lock member.

Further, the solution means taken by the invention of claim 3 specifies the engaging portion and the vibration absorbing means of the invention of claim 1, wherein the engaging portion is a bonnet stopper provided on the vehicle body. , An engaging member which is provided on the bonnet and engages and disengages with the bonnet stopper.
The bonnet stopper is made of an elastic material that engages with the engaging member by elastic deformation, and the bonnet stopper constitutes vibration absorbing means.

[0009]

With the above construction, in the inventions according to claims 1 to 3, the bonnet rotatably supported on the vehicle body is provided with an engagement portion composed of, for example, a striker and a lock member, and a bonnet stopper when the bonnet is closed. It is adapted to be engaged with the vehicle body via an engaging portion composed of an engaging member.

In this case, the engaging portion is provided with an elastic material which is provided around the existing striker and is elastically deformable with the lock member, or a bonnet made of an elastic material which is engaged with the engaging member by elastic deformation. Since the vibration absorbing means is composed of a stopper and the like, and the bonnet is elastically engaged with the vehicle body so that the vehicle body vibration is absorbed by the mass of the bonnet, a dynamic damper that effectively uses the bonnet itself is provided in front of the vehicle body. It will be installed over a wide area on the vehicle part, and the vehicle body vibrations generated from each part of the vehicle body during traveling are reliably absorbed without being amplified by the bonnet,
Steering vibration transmitted through the steering wheel, which is uncomfortable for the driver, is effectively reduced.

[0011]

As described above, according to the vehicle body structure of the front part of the invention in claim 1, the engaging portion is provided with the vibration absorbing means for elastically supporting the bonnet on the vehicle body to absorb the vehicle body vibration. Therefore, the dynamic damper covering a wide range can be configured by the bonnet in the front part of the vehicle body, and the vehicle body vibration can be absorbed by the bonnet to effectively reduce the steering vibration.

According to the front vehicle body structure of the automobile in the invention described in claim 2, the vibration absorbing means for elastically deforming the elastic material around the striker with the lock member,
By improving the existing lock device, a wide range of dynamic dampers can be easily configured by the bonnet, and effective reduction of steering vibration can be easily achieved.

Further, according to the vehicle body structure of the front part of the invention in the third aspect, the vibration absorbing means in which the engaging member of the bonnet is engaged with the elastically deformable bonnet stopper allows a wide range with a simple structure. The dynamic damper that extends over the bonnet can be configured more simply, and effective reduction of steering vibration can be achieved more easily.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows a front vehicle body structure of an automobile according to a first embodiment of the present invention. Reference numeral 1 is a bonnet for closing an engine room 2 provided in the front portion of the vehicle body from above.
The bonnet 1 is rotatably supported on the rear edge (vehicle body) of the engine room 2 via a pair of left and right hinges (not shown). Further, between the center position of the lower surface of the front end of the bonnet 1 and the substantially center position of the shroud upper 3 (vehicle body) that extends in the vehicle width direction at the front edge of the engine room 2, the bonnet 1 is closed when the bonnet is closed. A lock device 4 is provided as an engaging portion that engages with and disengages with.

The locking device 4 has a substantially U-shaped striker 12 whose front and rear ends are fixed to the central position of the lower surface of the front end of the bonnet 1 corresponding to the front grill 11 of the vehicle body, and the shroud upper 3 corresponding to the striker 12. And a latch base member 13 as a lock member that is fixed to the front end surface substantially at the center position. In addition, the latch base member 1
3, a vertical groove 14 is formed in the central portion of the central groove 3 so as to be cut downward from the upper end thereof. When the bonnet 1 is opened or closed, the striker 12 is inserted into the vertical groove 14 and comes out again. ing. In this case, the vertical cross section of the central portion of the striker 12 has a substantially circular shape. On the other hand, the latch base member 13 has a substantially hat-shaped horizontal cross section, and the left and right wing portions 13 of the latch base member 13 are formed.
a and 13a are fasteners 15 and 1 such as bolts and nuts
The front end surface of the shroud upper 3 is fastened and fixed by 5 at a substantially central position.

Further, as shown in FIG. 1, a fork lever 16 and a claw lever 17 are sandwiched by the vertical groove 14 on the rear surface side (rear surface side) of the latch base member 13 by fulcrum pins 18 and 19, respectively. It is rotatably attached. Of these, the fork lever 16 has a concave fork portion 20a and a lock portion 20b at the tip of its peripheral surface.
And the striker 12 is pulled out from the vertical groove 14, the spring member 21 attached to the latch base member 13 and the fork lever 16 acts to move the fork portion 20a upward in the vertical groove 14. When the striker 12 is thrust into the vertical groove 14 from this state, the striker 12 is fitted into the fork portion 20a and the fork lever 16 pivots downward, that is, the striker 12 Is constrained to move to the bonnet latch position.

On the other hand, the claw lever 17 is for locking the striker 12 and the fork lever 16 under engagement, and the claw lever 17 is formed with a claw 22 on the fork lever side, By the action of the spring member 23 stretched between the lever 17 and the latch base member 13, the pawl 22 is constantly urged to the posture in which it comes into contact with the peripheral surface of the fork lever 16, and as described above,
As the striker 12 is pushed down,
Is projected into the lock portion 20b, and the fork lever 16 is locked by the force of the spring member 23.

The unlocking operation by the claw lever 17 is performed from the inside of the vehicle compartment.
And are connected by a wire cable 24. In that case, the outer tube 24a in the wire cable 24
With one end of the inner wire 24b fixed to the latch base member 13, the tip of the inner wire 24b is connected to the claw lever 17,
As a result, when the wire cable 24 is pulled from the passenger compartment side, the claw lever 17 is rotated clockwise from the position shown in FIG. 1, and the pawl 22 is disengaged from the lock portion 20b.

Further, as shown in FIG. 2, a hook lever 25 is attached to the front side of the latch base member 13. The hook lever 25 is rotatable about a shaft 26 and its rotation range is within the latch base member 13.
The hook lever 25 is regulated by a pair of stoppers 27 and 28 on the open side and the close side formed by cutting and raising, and the hook lever 25 is acted on by the action of the spring member 29 that is tensioned between the latch base member 13. It is urged to stand up along the line 14. Furthermore, the hook lever 25
Is a neck base 25a attached to the shaft 26
A neck portion 25b extending upward along the vertical groove 14 is formed, and a hook portion 25c for closing the inlet of the vertical groove 14 is provided at the tip of the neck portion 25b.

Further, the hook lever 25 is provided with a stop lever portion 30 which is bent from the neck portion base 25a in a substantially L shape toward the front side of the vehicle body. The stop lever portion 30 is formed by the stop lever portion 30. , 28, a hole (not shown) is formed at the tip of the stop lever portion 30 to lock one end of the spring member 29, and the other end of the spring member 29 is connected to the latch base. Member 13
It is hooked on a hooking portion 31 provided on the. in this case,
The stop lever portion 30 also serves as a hook portion for the spring member 29.

As a characteristic part of the present invention, the locking device 4 elastically supports the bonnet 1 with respect to the shroud upper 3 and is generated from various parts of the vehicle body.
Vibration absorbing means 41 is provided for absorbing the vehicle body vibration transmitted via a steering wheel (not shown) that is uncomfortable for the driver, by the mass of the bonnet 1. The vibration absorbing means 41, as shown in detail in FIG.
The elastic member 42a which is adhered in a cylindrical shape around the central portion of 2
And an elastic bush 42 composed of a metal tube 42b attached around the elastic member 42a.
Is elastically deformed between the central portion of the striker 12 and the inside of the vertical groove 14 of the latch base member 13 via the metal tube 42b so that the vehicle body vibration is absorbed by the mass of the bonnet 1.

Further, as shown in FIG. 5, the bonnet is provided on the side edge of the engine room 2 corresponding to the space between the shroud upper 3 and the suspension tower portion 43 provided substantially at the center of the side edge of the engine room 2. There is provided a bonnet stopper (not shown) that receives 1 in its closed position. In this case, the bonnet stopper is made of an elastic material and has a spring constant of 22 (kg / m
m).

Therefore, in the above embodiment, the bonnet 1 rotatably supported at the rear edge of the engine room 2 is
When the bonnet is closed, the striker 12 and the latch base member 1
The shroud upper 3 via the lock device 4 composed of
To be engaged with.

In that case, in the lock device 4, the elastic material 42a attached to the outer circumference of the existing striker 12 is provided between the striker 12 and the inside of the vertical groove 14 of the latch base member 13 through the metal tube 42b. The vibration absorbing means 41 for elastically deforming the bonnet 1 is constituted by the shroud upper 3
The vehicle body vibration is elastically supported by the bonnet 1 to be absorbed by the mass of the bonnet 1. That is, as shown in FIG. 6, the vehicle body vibration transmitted as steering vibration via the steering with respect to the engine speed has a vibration characteristic shown by a solid line in the figure in which the vibration absorbing means 41 is provided in the lock device 4, which causes vibration to the lock device. Compared to the vibration characteristics shown by the broken line in the figure without absorbing means, about 600 rpm to about 900 r
Since it is considerably low in the pm range, it is proved that it is considerably reduced. As a result, the dynamic damper that effectively uses the bonnet 1 itself is installed over a wide area in the front part of the vehicle body, and the vehicle body vibration generated from each part of the vehicle body during traveling is surely prevented from being amplified by the bonnet 1. The steering vibration that is absorbed and transmitted via the steering wheel that is uncomfortable for the driver is effectively reduced.

As a result, the existing locking device can be improved to easily construct a dynamic damper over a wide range by effectively utilizing the bonnet 1 itself, and effective reduction of steering vibration can be easily achieved.

In the above embodiment, the striker 12 is provided on the bonnet 1 and the latch base member 13 is provided on the shroud upper 3. However, the striker is provided on the shroud upper and the latch base member is provided on the bonnet. It may be a device.

Next, a second embodiment of the present invention will be described with reference to FIGS.

The second embodiment is an improvement of the vibration absorbing means of the first embodiment (note that the same parts as those in the above embodiment are designated by the same reference numerals and their detailed description will be omitted. ).

That is, in this embodiment, the striker 12 is directly inserted into the vertical groove 14 of the latch base member 13, and the engaging portion 50 for elastically supporting the bonnet 1 against the side edge of the engine room as a vehicle body. Is composed of a bonnet stopper 51 and an engagement member 52 which is detachably engaged with the bonnet stopper 51. The vibration absorbing means 53 is the bonnet stopper 51 made of an elastic material that engages the engaging member 52 by elastic deformation, and the bonnet stopper 51 and the engaging member 52 cover a wide range of bonnets in the front part of the vehicle body. It constitutes a dynamic damper that effectively uses itself.

Regarding the installation position of the bonnet stopper 51, as shown in FIG. 7, in consideration of the vibration mode of the bonnet 1 itself (indicated by an arrow in the figure) when the bonnet 1 is used as a dynamic damper, It is provided at the side edge front end position of the engine room 2 as close as possible to the shroud upper 3.

Further, as shown in FIG. 8, the engaging member 5 is
The tip of 2 is formed in a wedge shape so as to be restrained not only in the compression direction in which it is inserted but also in the pulling direction in which it is pulled out, with respect to the recessed fitting hole 51a provided in the bonnet stopper 51. On the other hand, the spring constant of the bonnet stopper 51 is set to about 22 (kg / mm) in the normal bonnet stopper described in the first embodiment, while it is about 11 (kg / mm), which is half of that. It is set to a soft value.

As a result, as shown in FIG. 9, the steering vibration (vehicle body vibration) with respect to the engine speed is shown by the solid line in the figure in which the spring constant of the bonnet stopper 51 is set to a soft value of about 11 (kg / mm). The vibration constant of the bonnet stopper is 22 (kg / m
m) is about 650 rpm to about 900 rp compared to the vibration characteristics shown by the broken line in the figure without the vibration absorbing means.
Since it is considerably low in the range of m, it is proved that it is considerably reduced. As a result, a wide range of dynamic dampers can be configured with a simple structure by effectively using the bonnet, and effective reduction of steering vibration can be achieved more easily.

Next, a third embodiment of the present invention will be described with reference to FIGS.

The third embodiment is a further improvement of the vibration absorbing means.

That is, in this embodiment, the vibration absorbing means 41 for elastically deforming the elastic material 42a attached to the outer periphery of the striker 12 in the vertical groove 14 of the latch base member 13 in the first embodiment, and the second embodiment. In the above, the engaging member 52 is also used in combination with the vibration absorbing means 53 composed of the bonnet stopper 51 which is engaged by elastic deformation of the elastic material set to have a spring constant of about 11 (kg / mm). And as the installation position of the bonnet stopper 51,
As shown in FIG. 10, the engine room 2 between the shroud upper 3 and the suspension tower portion 43 is considered in consideration of the vibration mode of the bonnet 1 itself (indicated by the arrow in the figure) when the bonnet 1 is used as a dynamic damper. It is provided at a substantially middle position of the side edge.

As a result, as shown in FIG. 11, the steering vibration (vehicle body vibration) with respect to the engine speed has a vibration characteristic shown by the solid line in the figure in which the vibration absorbing means 41 and 53 are used together, and the spring constant of the bonnet stopper is 11 ( kg / m
m) about 600 rpm to about 9 rpm as compared with the vibration characteristics shown by the broken line in the figure which employs only the vibration absorbing means 53.
Since it is considerably low in the range of 00 rpm, it is proved that it is considerably reduced. This allows
A dynamic damper over a wide range can be configured relatively easily by effectively using the bonnet, and effective reduction of steering vibration can be easily achieved.

[Brief description of drawings]

1 is a cross-sectional view taken along the line AA of FIG.

FIG. 2 is a sectional view taken along line BB in FIG.

FIG. 3 is a vertical cross-sectional side view of the front end portion of the vehicle body showing the vicinity of the lock device according to the first embodiment.

FIG. 4 is a vertical sectional view of a central portion of the striker according to the first embodiment.

FIG. 5 is a vertical sectional side view of the bonnet according to the first embodiment.

FIG. 6 is a characteristic diagram showing steering vibration characteristics with respect to the engine speed according to the first embodiment.

FIG. 7 is a view corresponding to FIG. 5 according to the second embodiment.

FIG. 8 is a vertical sectional side view of a front end portion of the vehicle body showing the vicinity of an engaging portion according to a second embodiment.

FIG. 9 is a view corresponding to FIG. 6 according to the second embodiment.

FIG. 10 is a view corresponding to FIG. 5 according to the third embodiment.

FIG. 11 is a view corresponding to FIG. 6 according to the third embodiment.

[Explanation of symbols]

1 bonnet 3 shroud upper (vehicle body to be engaged when the bonnet is closed) 4 locking device (engaging part) 12 striker 13 latch base member (locking member) 41, 53 vibration absorbing means 42a elastic material 50 engaging part 51 bonnet stopper 52 engaging Plywood

Claims (3)

[Claims] 1. A front vehicle body structure for an automobile, comprising an engaging portion for engaging the bonnet with the vehicle body when the bonnet rotatably supported by the vehicle body is closed, wherein the engaging portion has a bonnet. A front vehicle body structure for an automobile, characterized in that a vibration absorbing means is provided for elastically supporting the vehicle body with respect to the vehicle body and absorbing vehicle body vibrations by the mass of the bonnet. 2. An engagement portion is provided on either one of the bonnet and the vehicle body, and the other of the vehicle body and the bonnet, and the lock engages and disengages the striker. 7. A vibration absorbing means is provided around the striker and is formed of an elastic material that is elastically deformable between the striker and the lock member. 1. The front body structure of the automobile according to 1. 3. The engagement portion includes a bonnet stopper provided on the vehicle body and an engagement member provided on the bonnet and engageably and disengageably engaged with the bonnet stopper. The bonnet stopper is elastically deformable. The vibration absorbing means is made of an elastic material that engages with the engaging member, and the bonnet stopper constitutes a vibration absorbing means.
Front body structure of the described vehicle.