JPH0412869Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a support structure for a cabin, in particular, a cabin support structure in which the cabin is supported on a vehicle body frame via a front mount part and a rear mount part. It's about structure.

(Prior Art) In vehicles such as trucks, the passenger cabin is generally elastically supported by the vehicle body frame at the front of the vehicle body via a front mount portion and a rear mount portion. It is designed to absorb shocks, vibrations, etc. from the vehicle frame. The support structures conventionally used for such a cabin can be broadly classified as follows. In other words, both the front mount part and the rear mount part are made of rubber (hereinafter referred to as the rubber mount type), as disclosed in Utility Model Application Publication No. 169277/1983. There are three types: those consisting of a coil spring and a damper (so-called full floating type), and those consisting of rubber on the front side and a spring and damper on the rear side (so-called semi-floating type). The rubber mount type has a simple structure and can be manufactured at low cost, but it is inferior in riding comfort, while the full floating type provides good riding comfort but has a complicated structure and is expensive. The above-mentioned semi-floating type can provide relatively good riding comfort without requiring much cost, and can be said to be preferable in terms of both performance and cost.

However, even with this semi-floating type, vibrations occur in a specific vibration frequency range at a predetermined vehicle speed, i.e., vibrations in the frequency range of around 6 to 8 Hz that occur when external forces with vertically opposite phases are applied to the front and rear tires of the vehicle. If this happens, the problem remains that the cabin will pitch, which will have an adverse effect on the riding comfort of the occupants inside the cabin.

Furthermore, in the case where the cabin is tiltably supported with respect to the vehicle body frame, it is desirable to improve the tilt characteristics as much as possible.

(Purpose of the invention) The present invention was devised in view of the above circumstances, and is a support for a cabin that can provide good ride comfort at a relatively low cost and also improve the tilt characteristics of the cabin. The purpose is to provide structure.

(Structure of the invention) The cabin support structure according to the invention consists of a front mount part made of rubber and a damper.
The first feature is that the rear mount section is composed of a coil spring and a damper. In other words, by adding a damper to the front mount of the semi-floating type support structure, we can take advantage of the advantage of the semi-floating type that it can be manufactured at relatively low cost. This improves the deterioration of vibration characteristics in a specific frequency range, which is a disadvantage, and thereby makes it possible to obtain good ride comfort over a wide range of vibration frequencies.

Furthermore, in the present invention, when providing the above-mentioned front-side damper, the connecting portion of the damper to the cabin side is located on the vehicle body frame side with respect to the rotational center of the cabin, and thereby,
This is characterized by an attempt to improve the tilt characteristics of the cabin. That is, in the present invention, the front damper is not simply provided between the front end of the cabin and the vehicle body frame;
Since it is provided between the extension part of the first bracket member located closer to the body frame than the shaft member fixing part and the body frame, when the cabin is tilted,
The stroke displacement amount of the damper becomes variable with respect to a unit rotation angle of the cabin, and accordingly, the damping force of the damper also acts variably. Specifically, when rotating the cabin from the installed state to the tilted state, the damping force is small in the early stages, which reduces the operating force, whereas in the later stages, the damping force is large, and the cabin rotates all at once. It is possible to stop the cabin in a tilted state after preventing it from moving. In addition, when the cabin is rotated from the tilted state to the installed state, a large damping force is generated at the initial stage, which prevents the cabin from accidentally rotating toward the body frame during service work. In this case, since the damping force is small, the cabin can be installed on the vehicle body frame side in one go, and thus the locking means can be easily engaged.

(Example) An example of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a front side view of a vehicle showing an outline of a support structure for a cabin according to this embodiment.

The cabin 1 is attached to a vehicle body frame 4 via a front mount 2 and a rear mount 3.
is supported by These front and rear mounts 2 and 3 are arranged in pairs on each side of the vehicle body, and are structured so that the cabin 1 can roll forward about the front mount 2.

2 to 5 are enlarged views of essential parts of the cabin support structure, with FIGS. 2 and 3 showing the front mount part 2 in detail, and FIGS. 4 and 5 showing the rear mount part 3 in detail, respectively. .

FIG. 2 is a front view showing the front mount portion 2 on the right side of the vehicle from the front of the vehicle.

A U-shaped bracket 6 extending in the longitudinal direction along the frame 5 is joined to the lower surface of a frame 5 provided on the lower surface of the cabin 1 and extending in the longitudinal direction of the vehicle. A pipe 7 is provided extending in the vehicle width direction, passing through a hole formed in the vertical side wall. A disk 8 concentric with the pipe 7 is provided on the outside of the U-shaped bracket 6 in the vehicle width direction, and is joined to the U-shaped bracket 6, and a rubber bush 9 is further provided on the outside of the disk 8. Rubber butt 9
Rubber 13 is filled between a cylinder 10 in sliding contact with the pipe 7 and an outer cylinder 12 having a flange 11 formed on the inner side in the vehicle width direction. An extended portion 14 is formed, and a plate-shaped metal ring 15 is fixed to the inner end surface of the extended portion 14 in the vehicle width direction. The inner diameter of the ring 15 is approximately the same as the outer diameter of a small diameter portion formed on the outer side of the disk 8 in the vehicle width direction.

An annular portion 17 formed on the upper part of a support bracket 16 that supports the rubber bush 9 is provided on the outer periphery of the outer cylinder 12 of the rubber bush 9 in sliding contact with the support bracket 16.
A bracket 1 is supported through a buffer member 18 and is simultaneously fixed to the inside of the vehicle body frame 4 in the vehicle width direction.
It is supported by 9.

Another bracket 20 is joined to the bracket 19, and a lower end shaft 22 of a damper 21 is pivotally supported on the inner wall of this bracket 20 in the vehicle width direction. The upper end shaft 23 of the damper 21 is pivotally supported by a pair of U-shaped plates 24 joined to the U-shaped bracket 6. FIG. 3 is a side view of the mount portion 2 viewed from the inside in the vehicle width direction.

In FIG. 2, the vertical relative displacement between the cabin 1 and the vehicle body frame 4 caused by vibrations, shocks, etc. acting on the vehicle is regulated by a rubber bush 9 and a damper 21 provided on the mount portion 2. The elastic force of the rubber 13 and the action of the damper 21 attenuate the acceleration of vertical displacement.

Note that the relative displacement in the left and right direction between the cabin 1 and the vehicle body frame 4 is determined by the rubber 13 of the rubber bush 9.
is elastically regulated by compressive deformation of the extension portion 14. This action is performed by one of the mount portions 2 provided symmetrically on both sides of the vehicle body.
Further, when the cabin 1 is rolled around the pipe 7, the disk 8 that rotates together with the cabin 1 and the ring fixed to the extension 14 of the rubber 13 slide, and this causes wear and tear on the extension 14. It is now possible to prevent

FIG. 4 is a front view of the rear mount portion 3 on the right side of the vehicle from the front of the vehicle, and FIG. 5 is a side view of the mount portion 3 from the inside in the vehicle width direction.

As shown in FIG. 5, the mount portion 3 includes a cab mount wedge 28 that supports a bracket 26 provided at the lower end of the cabin 1 (see FIG. It consists of a fixed support bracket 29, a spring mechanism 30 interposed between the cab mount wedge 28 and the support bracket 29, and a damper 31 connected to the spring mechanism 30 and the vehicle body frame 4. ing.

The spring mechanism 30 has coil springs 32 disposed on both the upper and lower sides of the upper plane of the support bracket 29, and press plates 34 disposed at both ends of these springs 32 with a buffer material 33 in between, to support both the upper and lower press plates 34. It is fastened with a long bolt-shaped rod 35 that passes through the bracket 29. The upper pressure plate 34 and the lower pressure plate 34 together with the cab mount wedge 28 and the U-shaped bracket 36 are respectively fastened to the rod 35. An engagement piece 38 is attached to the upper end of the rod 35 to engage with a hook 37 provided on the cabin 1, thereby preventing the cabin 1 from floating up. Note that the forward rolling motion of the cabin 1 is performed by removing the hook 37 from the engagement piece 38. Rubbers 39, 3 are provided on the inner surfaces of the upper and lower pressing plates 34 to elastically restrict further displacement when the spring 32 is compressed and displaced by a predetermined value or more.
9' are fixed respectively. This rubber 39,
The action of the stopper 39' is achieved by the rubbers 39, 39' coming into pressure contact with an annular rubber 41 fixed to a plate 40 bolted to both upper and lower sides of the upper plane of the support bracket 29. .

As shown in FIG. 4, a damper 31 is attached to a U-shaped bracket 36 fastened to the lower end of the rod 35.
An upper end shaft 42 is elastically supported, and a lower end shaft 43 of the damper 31 is supported by a pair of brackets 44 fixed to the lower end of the support bracket 29.

In FIG. 5, relative displacement in the vertical direction between the cabin 1 and the vehicle body frame 4 caused by vibrations, shocks, etc. acting on the vehicle is regulated by the action of a spring mechanism 30 and a damper 31 provided on the mount portion 3. , and at this time, the acceleration of the vertical displacement is attenuated by the elastic force of the spring 32 and the action of the damper 31.

FIG. 6 is a diagram showing the function of the cabin support structure according to this embodiment in comparison with conventional cabin support structures, such as a rubber mount type, a semi-floating type, and a full-floating type. 3 is a graph showing vibration frequency characteristics of vertical acceleration power spectrum density acting on a human body in FIG.

As is clear from the figure, the problem with the conventional semi-floating type is that pitching occurs in the cabin 1, resulting in a frequency of 6 to 8 Hz.
The problem of deterioration of the acceleration power spectrum density in the vicinity (worse than that of the rubber mount type) is greatly improved by adopting the support structure of the cabin according to this embodiment.
Characteristics close to those of the full floating type are obtained over the entire frequency range.

(Effects of the invention) As detailed above, the cabin support structure according to the invention is a so-called semi-semi-contact structure in which the front mount part is composed of rubber and a damper, and the rear mount part is composed of a coil spring and a damper. The floating type support structure has a structure in which a damper is added to the front side mount, so it is possible to prevent occupants inside the cabin from being affected by vibrations in a specific frequency range, which has been a problem with conventional semi-floating types. The negative effect on riding comfort can be significantly improved, and this effect can be achieved with an extremely simple structure and at a lower cost than the full floating type. Furthermore, compared to the full floating type, the space required for the front mount section can be reduced, so the degree of freedom in layout near the mount section is increased.

Furthermore, in the present invention, since the connection part of the front damper to the cabin side is located on the vehicle body frame side with respect to the rotation center of the cabin, when the cabin is tilted, the unit of the cabin is The stroke displacement amount of the damper becomes variable with respect to the rotation angle, and accordingly, the damping force of the damper also acts variably, thereby making it possible to improve the tiltability of the cabin.

[Brief explanation of the drawing]

FIG. 1 is a side view of the front of the vehicle showing an example of the cabin support structure according to the present invention, and FIG. 2 is a front view from the front of the vehicle showing details of the front mount.
Figure 3 is a side view showing the mount part from the inside in the vehicle width direction, Figure 4 is a front view from the front of the vehicle showing the rear mount part in detail, and Figure 5 is a side view showing the mount part from the inside in the vehicle width direction. The side view shown in FIG. 6 is a graph showing the frequency characteristics of the acceleration power spectral density, which shows the function of the support structure of the cabin in comparison with a conventional support structure. 1...Cabin, 2...Front side mount, 3...Rear side mount, 4...Vehicle frame, 6...Bracket (first bracket member),
7... Pipe (shaft member), 9... Rubber bush (rubber member), 16... Support bracket (second bracket member), 21... Damper (front damper) 24... U-shaped plate (first bracket member) extension part), 30...spring mechanism, 31
...damper (rear damper), 37... hook (locking means), 38... engaging piece (locking means).

Claims (1)

[Claims for Utility Model Registration] A cabin support structure in which a cabin is elastically supported on a vehicle body frame, which is provided between a rear end of the cabin and the vehicle body frame, and includes a coil spring and a rear damper. a rear side mount portion that is attached to the rear side mount portion; a locking means that detachably connects the rear end portion of the cabin to the vehicle body frame; a first bracket member that is fixed to the front end portion of the cabin and extends toward the vehicle body frame; a shaft member fixed to a first bracket member and extending in the vehicle width direction; and a shaft member fixed to the vehicle body frame and extending toward the cabin side, the shaft member being rotatable around an axis in the vehicle width direction via a rubber member. a second bracket member that is pivotally supported; and a front damper provided between an extension portion of the first bracket member that is located closer to the vehicle body frame than the shaft member fixing portion and the vehicle body frame. A support structure for the cabin characterized by: