JP2009132290A - Body structure of vehicle with frame - Google Patents

Abstract

An object of the present invention is to provide a vehicle body structure for a vehicle with a frame that more easily reduces vibrations of the vehicle body.
A vehicle body body portion including a cabin forming portion and a deck portion, a frame member that supports the vehicle body body portion from below, and a shock absorber that is swingably supported by the frame member. A vehicle body structure of a vehicle with a vibration isolator for connecting the cabin forming portion and the deck portion, and a pressure adjusting valve provided in the middle of a pipe connecting the vibration isolator and the shock absorber. And the pressure regulating valve is released when the shock absorber receives a pressure of a predetermined value or more, and the vibration isolator attenuates based on the pressure received when the pressure regulating valve is released. Body structure of a vehicle with a frame.
[Selection] Figure 3

Description

  The present invention relates to a vehicle body structure of a vehicle with a frame.

  2. Description of the Related Art Conventionally, as a vehicle body structure of an automobile or the like, a vehicle body structure of a vehicle with a frame provided with a frame member that supports a vehicle body main body from below is known.

  FIG. 1 is a diagram for explaining a vehicle body structure of a conventional vehicle with a frame. In FIG. 1, a vehicle 1 with a frame including a vehicle body body including an independent cabin 10 and a deck 20 and a frame 30 that supports the vehicle body from the lower side receives, for example, a force from a road surface. This shows a simple manner in which the vehicle bending vibration mode is excited and the cabin 10 causes pitching (pitch of the vehicle), particularly when the left and right wheels stroke in the same phase. Such pitching or the like is an unpleasant vibration for the vehicle user.

  Various techniques relating to the vehicle body structure of such a vehicle with a frame are disclosed.

  For example, in Patent Document 1, in a vehicle body structure of a vehicle with a frame, mount members are disposed between a cabin forming portion, a front portion, and a rear portion, and pitching, rolling, or bouncing acts on the independent cabin portion. A technique for suppressing the occurrence of the rigid body vibration by enhancing the restraint at the time of the process is disclosed. Here, the rigid body vibration is suppressed by devising the rigidity / mass distribution of the vehicle body and the frame member.

Further, in Patent Document 2, in the vehicle body structure of a vehicle with a frame, the rigidity of each of the plurality of body mounts is set to a value that makes the node position of the bending vibration mode of the chassis frame coincide with the load input point from the ground side with respect to the chassis frame. A technique for suppressing the vibration of the skeleton member of the vehicle body from being amplified by setting individually is disclosed.
JP-A-6-286648 JP 2002-356180 A

  In the conventional technology as described above, the vibration suppression of the vehicle body is realized by changing the characteristics such as rigidity / mass distribution of the body mount, or by changing the vibration characteristics using dampers such as a dynamic damper and a mass damper. It was done by.

  However, in changing the characteristics of the body mount, many requirements are required in determining the characteristics to be changed. In addition, the countermeasure weight is increased even when the vibration characteristics are changed by using dampers. This is because it is difficult to change the vibration characteristics with a damper or the like because a relatively low-order vibration mode such as vehicle bending resonance is mainly used in the riding comfort frequency region.

  The present invention has been invented in order to solve this problem in view of the above points, and an object of the present invention is to provide a vehicle body structure for a vehicle with a frame that can more easily reduce the vibration of the vehicle body.

  In order to achieve the above object, a vehicle body structure of a vehicle with a frame according to the present invention includes a vehicle body main body including a cabin forming portion and a deck, a frame member for supporting the vehicle main body from below, and the frame. A vehicle body structure of a vehicle with a frame including a shock absorber supported swingably on a member, wherein the vibration isolating device connects the cabin forming portion and the deck portion, and the vibration isolating device and the shock absorber. And a pressure adjusting valve that is provided in the middle of the pipe and that causes pressure to flow out to the vibration isolator when the shock absorber receives a pressure of a predetermined value or more, The anti-vibration device can be configured to perform anti-vibration based on the pressure flowing out from the pressure adjusting valve.

  Moreover, in order to achieve said objective, the said vibration isolator in this invention can be comprised so that it may be a liquid enclosure type vibration isolator.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle body structure of the vehicle with a frame which implement | achieves the vibration reduction of a vehicle body more simply can be provided.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

[Embodiment]
(Vehicle overview)
FIG. 2 is a diagram illustrating an outline of a vehicle in which the vehicle body structure according to the present embodiment is used. A vehicle 1 such as an automobile shown in FIG. 2 includes a cabin (cabin forming portion) 10, a deck (deck portion) 20, a frame (frame member) 30, and the like. In FIG. 2, the vehicle 1 is shown in a simplified manner.

  The cabin 10 refers to a portion of a guest room that is a space used by a vehicle user in the vehicle 1. It is a part formed of pillars, roofs, glass, and the like. The deck 20 refers to an entrance / exit portion of the vehicle 1. When the vehicle 1 is a pickup vehicle, it is a cargo bed portion. FIG. 2 shows an example in which the vehicle 1 is a pickup vehicle.

  The frame 30 is a member that supports the independent cabin 10 and the deck 29 (hereinafter, a portion including the cabin 10 and the deck is referred to as a “vehicle body”) from below. A body mount or the like (not shown) is provided between the vehicle body and the frame 30.

  The vibration reducing unit 40 is a part that reduces vibrations such as pitching of the cabin 10 according to the present embodiment. The detailed structure will be described later with reference to FIGS.

(Outline of the structure of the body structure)
FIG. 3 is a diagram showing an outline of the configuration of the vehicle body structure according to the present embodiment. The vibration reducing unit 40 shown in FIG. 3 has a configuration including a liquid seal Mt (liquid seal mount) 41, a valve 42, a pipe 43, and a shock absorber 44.

  The liquid seal Mt41 is a known liquid-sealed vibration isolator in which, for example, two liquid chambers in which a liquid is sealed are provided in rubber, and orifices are provided in the partition walls. 1 is provided so as to connect the cabin 10 and the deck 20 of FIG. The dynamic characteristic of the liquid seal Mt41 has a characteristic of being a high damping characteristic in a low frequency range or a low dynamic spring characteristic in a high frequency range.

  Here, the valve 42 is a pressure adjusting valve that performs pressure adjustment. When the pressure received from a shock absorber 44 (described later) through the pipe is equal to or higher than a certain pressure, the valve 42 is released, and the pressure flows out to the liquid seal Mt41. Here, the pressure value serving as the threshold value may be a value set according to the pitching vibration characteristics of the vehicle 1 or the like.

  The pipe 43 is a pipe that connects the liquid seal Mt 41 and a shock absorber 44 described later via a valve 42. A pressure received by a shock absorber 44 described later is transmitted to the valve 42.

  The shock absorber 44 is a mechanism that is swingably supported on the frame 30 of FIG. 2 and attenuates the vibration of the vehicle body of the vehicle 1. 3 is provided on the left side in the vehicle width direction, and the other is provided on the right side in the vehicle width direction.

  With the above configuration, according to the vehicle body structure according to the present embodiment, when the shock absorber 44 attached to the left and right wheels expands and contracts, for example, when receiving a force from the road surface (particularly when the left and right wheels stroke in the same phase) The pressure in the pipe 43 is increased, and pressure is applied to the valve 42 disposed between the left and right wheels. When the pressure applied to the valve 42 is equal to or higher than a certain pressure, the valve 42 is released. If it does so, the internal pressure (pipe internal pressure) of the piping 43 will be propagated to the liquid seal Mt41 with the release of the valve. The liquid seal Mt41 that has received the internal pressure is cured and highly attenuated in accordance with the received pressure.

  That is, when the shock absorber 44 and the liquid seal Mt41 are interlocked with each other and the left and right wheels are stroked in the same phase and it is detected that the input from the road surface is large, the cabin 10, The liquid seal Mt41 disposed between the decks 20 is hardened and highly attenuated. Therefore, it becomes possible to reduce the pitching vibration of the cabin 10.

  Note that when the left and right wheels make strokes in opposite phases, the pressure change due to the shock absorber 44 attached to the left and right wheels is canceled out in the pipe 43, so the valve 42 remains closed.

  Therefore, even if the characteristics of the liquid seal Mt41 are advantageously set to reduce the vibration of the cabin 10 when the left and right wheels are stroked in the same phase, the vibration of the cabin 10 may be deteriorated when the left and right wheels are stroked in the opposite phase. Absent.

  In this way, according to the present embodiment, it is possible to realize a reduction in unpleasant vibration for the vehicle user by the conventional pitching as shown in FIG.

(Specific examples of vehicle body structure)
FIG. 4 is a view showing a specific example of the vehicle body structure according to the present embodiment. Since the liquid seal Mt (liquid seal mount) 41, the valve 42, the pipe 43, and the shock absorber 44 in FIG. 4 are the same as the respective components in FIG. 3, each component will be supplemented here.

  The liquid seal Mt 41 is provided so as to connect the cabin 10 and the deck 20, and is connected to the shock absorber 44 via the pipe 43. In addition, the valve 42 is connected to each shock absorber 44 attached to the left and right wheels of the vehicle 1.

  Thus, as described above, when the shock absorber 44 attached to the left and right wheels expands and contracts, for example, when receiving a force from the road surface (especially when the left and right wheels stroke in the same phase), the pressure of the pipe 43 is increased. The pressure is applied to the valve 42 disposed between the left and right wheels. When the pressure applied to the valve 42 is equal to or higher than a certain pressure, the valve 42 is released. If it does so, the internal pressure (pipe internal pressure) of the piping 43 will be propagated to the liquid seal Mt41 with the release of the valve. The liquid seal Mt41 that has received the internal pressure is cured and highly attenuated in accordance with the received pressure.

  Note that when the left and right wheels stroke in opposite phases, the pressure change caused by the shock absorber 44 attached to the left and right wheels is canceled out in the pipe 43, so the valve 42 remains closed and the left and right wheels stroke in opposite phases. The vibration of the cabin 10 at the time is not worsened.

  As described above, according to the vehicle body structure according to the present embodiment, it is possible to switch the characteristics (spring, damping) of the liquid seal Mt41 in conjunction with the change in the cylinder pressure of the shock absorber 44.

(Modification of the body structure)
In the above description, as shown in FIG. 4, the case where the liquid seal Mt 41 is configured to connect the cabin 10 and the deck 20 has been described. However, in the present invention, the pressure fluctuation of the shock absorber 44 is measured. It is not limited to the liquid seal Mt41 as long as it is a member that can change the characteristics (spring, damping) by using it.

  As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the requirements shown here, such as combinations with other elements listed in the above embodiments. With respect to these points, the present invention can be changed within a range that does not detract from the gist of the present invention, and can be appropriately determined according to the application form.

It is a figure for demonstrating the vehicle body structure of the conventional vehicle with a frame. It is a figure showing the outline of the vehicles in which the vehicle body structure concerning this embodiment is used. It is a figure which shows the outline | summary of a structure of the vehicle body structure which concerns on this embodiment. It is a figure which shows the specific example of the vehicle body structure which concerns on this embodiment.

Explanation of symbols

1 Vehicle 10 Cabin 20 Deck 30 Frame 40 Vibration Reduction Part 41 Liquid Seal Mt
42 Valve 43 Piping 44 Shock absorber

Claims (2)

A vehicle body of a vehicle with a frame, comprising: a vehicle body body including a cabin forming portion and a deck; a frame member that supports the vehicle body from below; and a shock absorber that is swingably supported by the frame member Structure,
A vibration isolator that connects the cabin forming portion and the deck portion;
Piping for connecting the vibration isolator and the shock absorber;
A pressure adjusting valve provided in the middle of the piping, which causes the pressure to flow out to the vibration isolator when the shock absorber receives a pressure of a predetermined value or more;
Have
A vehicle body structure for a vehicle with a frame, wherein the vibration isolator performs vibration isolation based on the pressure discharged from the pressure adjusting valve.   The vehicle body structure of a vehicle with a frame according to claim 1, wherein the vibration isolator is a liquid-filled vibration isolator.

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