JPH04297375A - Frame structure for vehicle - Google Patents

Abstract

PURPOSE:To improve the extent of vibration isolating effect as well as to ameliorate an absorbing characteristic of collisional energy by utilizing a frame structure consisting of both first and second frames so effectively. CONSTITUTION:A second frame 13 is supported in a first frame 12 via a first elastic body 14. In addition, a cabin 2 is supported on one side frame 13 out of these frames 12, 13, while an engine 12 and both suspension systems 25F, 25R are supported on the other side frame 12.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle frame structure.

0002

2. Description of the Related Art Generally, a vehicle frame has a closed cross-sectional shape extending in the longitudinal direction at the end of the vehicle body, and a cabin serving as a vehicle interior is supported on this frame. The engine and suspension equipment are supported.

[0003] Also, within the first frame having a closed cross-section shape extending from the side end of the front part of the vehicle body in the front-rear direction, there is a second frame having a closed cross-section shape extending from the side end part of the rear part of the vehicle body in the front-rear direction. There is also a double structure supported at an intermediate position in the longitudinal direction of the vehicle body (see Japanese Utility Model Application No. 62-144776).

0004

[Problems to be Solved by the Invention] By the way, in the above-mentioned two frame structures, the cabin has a predetermined frequency that prevents vibrations transmitted from vibration sources such as the engine and suspension equipment from being directly transmitted to the frame. The band is supported by the frame via an elastic body with a modulus of elasticity that can exhibit a vibration insulating effect. In that case, the elastic modulus of the elastic body will be set after reviewing the handling stability aspect so that it can sufficiently withstand the lateral loads that act during turns, etc., and does not affect handling stability. .

However, with the elastic modulus of the elastic body set in consideration of handling stability, the frequency band of vibration is reduced, and the vibration isolation effect of the elastic body cannot be fully demonstrated. Can not.

[0006] Furthermore, an elastic body having an elastic modulus set in consideration of both vibration insulating effect and handling stability is weak in terms of rigidity and strength.

[0007] The present invention has been made in view of the above points, and its object is to effectively utilize the frame structure consisting of the first and second frames to improve the vibration insulation effect. This aims to improve the collision energy absorption characteristics.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a frame structure for a vehicle, in which a first frame having a closed cross section extending in the longitudinal direction of the vehicle body includes:
A second frame having a closed cross section extending in the front-rear direction is supported via an elastic body, and a cabin is supported on one of the first frame and the second frame; The other frame supports at least one of the engine and the suspension device.

[0009]

[Operation] With the above configuration, in the present invention, the cabin is
The frame is supported by one of a first frame and a second frame supported within the first frame via an elastic body, and at least one of the engine and the suspension device is connected to the other frame. Since the vibration source of at least one of the engine and suspension device, which is a vibration source, and the cabin are supported by the first and second frames, respectively, with an elastic body interposed therebetween, divided,
Vibration from one vibration source is difficult to be transmitted to the cabin via both frames. Furthermore, the elastic modulus of the elastic body interposed between the first frame and the second frame in the vertical direction is determined by the frequency band of vibrations from at least one of the vibration sources such as the engine and the suspension device. can be matched. Moreover, the first frame and the second frame
It is also possible to set the elastic modulus of the elastic body interposed laterally between the arm and the arm so as to sufficiently resist the lateral load that is applied during turning.

[0010] Furthermore, if the cabin is supported by one frame through an elastic body, the rigidity of the elastic body itself can be increased, and the cabin and one frame can be supported by the other frame.
The supporting rigidity between the frame and the frame is increased, and when collision energy acts on the frame during a collision, the frame can be buckled.

[0011]

[Effects of the Invention] As described above, according to the vehicle frame structure of the present invention, the vibration source of at least one of the engine and suspension device, which is a vibration source, and the cabin are connected with an elastic body interposed. By separating the first frame and the second frame, vibrations from one of the vibration sources are difficult to be transmitted to the cabin via the frame. The elastic modulus of the elastic body between the arms allows for good steering stability by sufficiently resisting lateral loads such as when turning, and the elasticity of the elastic body matches the frequency band of vibration from one vibration source. In combination with this ratio, the vibration insulation effect can be improved. Moreover, by increasing the support rigidity between the cabin and one of the frames, the energy at the time of a collision is transferred to the frame.
Collision energy is effectively absorbed by the buckling deformation of the
It is possible to improve the absorption characteristics of

0012

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings.

FIGS. 1 and 2 show an automobile using a frame structure according to an embodiment of the present invention, and a cabin 2 as a vehicle interior is constructed approximately at the center of a vehicle body 1 in the longitudinal direction. There is. Further, an engine room 3 is configured in front of the cabin 2, and the engine room 3 includes:
A horizontal type engine 4 is mounted with a crankshaft (not shown) arranged in the left-right direction of the vehicle body. Furthermore, a trunk room 5 is configured at the rear of the cabin 2.

A frame 11 is provided below the cabin 2, engine room 3, and trunk room 5, and extends from the side end of the vehicle body 1 in the longitudinal direction. The frame 1
1 includes a first frame 12 having a closed cross section formed by joining one panel material at the lower end, and a first frame 12 provided within the first frame and joining one panel material at the lower end. a second frame 13 having a closed cross-sectional shape, and the first frame 1
2 and the second frame 13 at predetermined intervals in the front-rear direction, and for elastically supporting the second frame 13 with respect to the first frame 12. It consists of.

Further, the engine 4 is mounted on the front part of the first frame 12 corresponding to the lower part of the engine room 3 via a plurality of mount rubbers 21 (only one location is shown in the figure). Elastically supported. Further, a front suspension device 25F including a coil spring 23F and a damper 24F is provided at the front part of the first frame 12 corresponding to the lower part of the engine room 3. Front wheel 26 through 24F
F is elastically supported by the first frame 12. moreover,
First frame 1 corresponding to the lower part of the trunk room 5
Similarly, a rear suspension device 25R equipped with a coil spring 23R and a damper 24R is provided at the rear of the vehicle.
The rear wheel 26R is elastically supported by the first frame 12 via the rear wheel 4R.

Further, an inner end of a side sill 32 having a closed cross section and extending in the longitudinal direction of the vehicle body is joined to the side end of the floor panel 31 forming the lower surface of the cabin 2. This side sill 32 is connected to the inner panel. 33a and a step panel 33c, which partially serves as the outer panel 33b, are joined together. As shown in FIG. 3, in the intermediate portion of the first frame 12 corresponding to the lower part of the cabin 2, a plurality of openings 34, which open upward are provided at predetermined intervals in the front-rear direction. Between the second frame 13 and the side sill 32 corresponding to these openings 34,
A second elastic body 35 is provided for elastically supporting the cabin 2 with respect to the second frame 13. The second elastic body 3
5 has an upper part fitted into a first hole 36 provided in the outer panel 33b of the side sill 32, and a lower part fitted into a second hole 37 provided in the upper part of the second frame 13. bolts 4 that are fitted and inserted in the vertical direction
The amount of vertical expansion and contraction of the second elastic body 35 is regulated by a spacer 39 having collars 38, 38, which is fixed to the upper and lower surfaces of the second elastic body 35 by the spacer 39. In this case, the openings 34,... of the first frame 12 are connected to the second elastic body 3.
It is located outside the middle part in the vertical direction of 5.

Therefore, in the above embodiment, the cabin 2
is applied to the second frame 13 in the first frame 12, which is elastically supported by the first elastic body 14 through the opening 34 of the first frame 12, through the second elastic body 35. The engine 4 is supported elastically by the first frame 12 via a mount rubber 21, and the suspension device 2
5F, 25R are supported by the first frame 12 via coil springs 23F, 23R and dampers 24F, 24R, so that the engine 4 and suspension devices 25F, 25R, which are vibration sources, and the cabin 2 are 1 elastic body 14 interposed between the first and second frames 12 and 13
Divided into each side. In this case, vibrations from vibration sources such as the engine 4 and suspension devices 25F and 25R are transmitted to the mount rubber 21 and the coil spring 23F.
, 23R and dampers 24F, 24R, and then to the second frame 13 via the first elastic body 14, and further via the second elastic body 35 to the cabin. Because it is transmitted to 2,
This makes it difficult for the signal to be transmitted to the cabin 2. Moreover, the elastic modulus of the first and second elastic bodies 14, 35 interposed between the first frame 12 and the second frame 13 in the vertical direction is determined from the engine 4 and the suspension devices 25F, 25R. can be matched to the vibration frequency band of In addition, the elastic modulus of the first and second elastic bodies 14 and 35 interposed between the first frame 12 and the second frame 13 in the lateral direction can be adjusted to accommodate lateral loads that act during turning. It can also be set to be sufficiently resistant. As a result, the elastic modulus of the first elastic body 14 between the first frame 12 and the second frame 13 sufficiently resists lateral loads such as when turning, and provides good steering stability. In combination with the elastic modulus of the first elastic body 14 that can match the frequency band of vibrations from vibration sources such as the engine 4 and the suspension devices 25F and 25R, the vibration insulation effect can be improved.

Furthermore, since the cabin 2 is supported by the second frame 13 via the second elastic body 35, by increasing the rigidity of the second elastic body 35 itself, the cabin 2 and the second frame are - The support rigidity between the first and second frames 13 is increased, and the collision energy is transferred to the first and second frames 1 during a collision.
2, 13, the first and second frames 1
2.13 buckling deformation is possible. As a result, energy at the time of collision can be effectively absorbed by the buckling deformation of the first and second frames 12, 13, thereby improving the collision energy absorption characteristics.

FIGS. 4 to 6 show a second embodiment of the present invention, in which the frame supporting the cabin and the frame supporting the engine and suspension device are modified. . Note that the same parts as in the above embodiment are given the same reference numerals, and detailed explanation thereof will be omitted.

That is, in this example, an opening 51 is provided in the front part of the first frame 12 corresponding to the lower part of the engine compartment 3.
, 51 are provided, and the engine 4 is mounted on the second frame 13 through one of the openings 51 through a plurality of mount rubbers 21 (only one location is shown in the figure). Elastically supported. Further, the front and rear vehicle body side support points of the substantially A-shaped suspension arm 52 are connected to the second frame 13 through the other opening 51, respectively, through the brackets 5.
A front suspension device 25F is installed via the coil spring 23F and the damper 2 of the front suspension device 25F.
Front wheel 26F is elastically supported by second frame 13 via 4F. Further, an opening 51 is also provided at the rear of the first frame 12 corresponding to the lower part of the trunk 5, and the suspension arm is similarly connected to the second frame 13 through this opening 51. (not shown), a rear suspension device 25R equipped with a coil spring 23R and a damper 24R is provided.
Rear wheel 26R is connected to the second frame via 3R and damper 24R.
It is elastically supported by the frame 13.

Furthermore, the outer panel 33 of the side sill 32
A plurality of second elastic bodies 35, . .

In this case, vibrations from vibration sources such as the engine 4 and suspension devices 25F, 25R are transmitted to the second frame 13 via the mount rubber 21, coil springs 23F, 23R, and dampers 24F, 24R, respectively. After that, the first frame 1 is attached via the first elastic body 14.
2 and is further transmitted to the cabin 2 via the second elastic body 35, so it is difficult to be transmitted to the cabin 2 as well.

It should be noted that the present invention is not limited to the above embodiments, but includes various other modifications. For example, in each of the above embodiments, the second frame 13 (or first frame 12) supports the cabin 2, and the first frame 12 (or first frame 12) supports the engine 4 and suspension devices 25F, 25R. The two frames 13) were individually modified, but the cabin is supported by one of the first and second frames, while the engine and the other frame are supported by the other frame. At least one of the suspension devices may be supported, and in this case, the other frame, in which the cabin is not supported, has elasticity depending on the frequency band of the vibration source of one of the engine and suspension devices. By using the first elastic body having a constant elasticity, it is possible to improve the vibration isolation effect of one of the vibration sources.

Further, in the above embodiment, only the cabin 2 is supported on the frame 13 (or 12) that is different from the frame 12 (or 13) that supports the engine 4 and the suspension devices 25F, 25R. The cabin and the trunk room or the engine room, or the cabin and the trunk room and the engine room, are configured to be supported by a frame different from the frame that supports the engine and the suspension device. Also good.

[Brief explanation of drawings]

FIG. 1 is a longitudinal side view of an automobile cut near the frame.

FIG. 2 is a perspective view showing a cross section near line II-II in FIG. 1;

FIG. 3 is a perspective view of the first frame.

FIG. 4 is a diagram corresponding to FIG. 1;

FIG. 5 is a perspective view showing a cross section near the line V-V in FIG. 4;

FIG. 6 is a perspective view of the frame showing the vicinity of the support portion of the suspension arm.

[Explanation of symbols]

2 Cabin 4 Engine 12 1st frame 13 Second frame 14 First elastic body (elastic body)

Claims (1)

[Claims] Claim 1: A first frame with a closed cross section extending in the longitudinal direction of the vehicle body includes a second frame with a closed cross section extending in the longitudinal direction of the vehicle body.
A frame is supported via an elastic body, and a cabin is supported on one of the first frame and the second frame, while a cabin is supported on the other frame. A vehicle frame structure characterized by supporting at least one of an engine and a suspension device.