JPS61241280A - Tilting device for automobile cabin - Google Patents

Abstract

PURPOSE:To enable a simple device to be employed so as to take cooling air in effectively by configurating a device in such a way that a tilt-up mechanism for a cabin is composed of a torsion bar and a link mechanism allowing the torsion bar to be arranged along a frame extending to the longitudinal direction. CONSTITUTION:A tilt-up mechanism 6 is provided along a frame 2 in the lower section of a cabin 3. And the above said mechanism 6 is composed of a torsion bar 7 which is arranged longitudinally along the inside of the frame 2, and a link mechanism 8. In this case, the rear end of the bar 7 is represented by a stationary section A, and the frot end is represented by a twisting section B. And the frame 2 is used to support both of them by way of bearing sections 9 and 9. In addition, the link mechanism 8 is composed of an upper arm 10, a lower arm 11, and a rod 12 extending up and down. Here, one end of the upper arm 10 is secured onto a set bracket 4, and the other end is connected with the upper end of the rod 12. On the other hand, one end of the lower arm 11 is fitted onto the above said twist section B, and the other end is connected to the lower end of the rod 12.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a tilt cab device for an automobile, such as a truck, whose cabin can be tilted forward.

(Prior Art) Trucks generally employ a tilt cab type vehicle body structure in which the cabin can be tilted forward in order to ensure serviceability for the engine and the like located below the cabin.

As a device for tilting such a cabin,
For example, as disclosed in Japanese Utility Model Application Publication No. 58-80378, there is a system in which the front part of the cabin is pivotally connected to a frame so as to be tiltable forward, and the cabin is lifted up by a hydraulic cylinder or the like. However, such a device requires equipment such as a hydraulic pump, a hydraulic circuit, and piping in addition to the hydraulic cylinder, making the structure complicated, expensive, and lacking in reliability.

On the other hand, a tilt cab device with a simple structure using a torsion bar is known. This is done by placing a torsion bar extending in the vehicle width direction below the front of the cabin, and twisting the torsion bar when the cabin is returned from the forward tilted position to the normal position. 1. In this state, the cabin and frame are appropriately locked. When the locking means is released, the cabin is tilted by the elastic restoring force of the torsion bar. However, when this tilt cab device is adopted, the torsion bar is located in the vehicle width direction near the cooling air introduction section below the front of the cabin, so it is difficult to operate the engine, radiator, etc. located below the rear of the cabin. This poses a problem in that it obstructs the introduction of cooling air and also restricts the layout of harnesses, ducts, cables, etc. that are arranged centrally at the lower front of the cabin.

(Object of the Invention) The present invention was made in view of the above-mentioned circumstances regarding tilt cab devices for automobiles, and has a simple structure and is suitable for cooling the engine, radiator, etc. disposed below the rear of the cabin. It is an object of the present invention to realize a tilt cab device that does not obstruct the supply of wind and does not restrict the layout of harnesses, ducts, cables, etc. arranged below the front of the cabin.

(Structure of the Invention) The tilt cab device for an automobile according to the present invention is characterized by having the following structure in order to achieve the above object.

That is, a tilt cab device for an automobile in which a cabin is capable of tilting forward, the front end of which is connected to the cabin via a link member along a frame member extending in the longitudinal direction at the lower side of the vehicle body, and the tip end of which is connected to the cabin via a link member. A spring member fixed to the frame member is provided. This spring member is composed of, for example, a torsion bar or a leaf spring, and is elastically deformed and stores elastic energy when the cabin is set in the normal position. According to such a configuration, a tilt cab device having a simple structure consisting only of a spring member and a link member is realized, and the spring member is disposed along a frame member extending in the longitudinal direction below the side of the vehicle body. This ensures a large, unobstructed space under the front of the cabin.

(Effects of the Invention) As described above, according to the present invention, there is provided a tilt cab device for an automobile whose cabin can tilt forward, which has an extremely simple structure, is inexpensive, and has excellent reliability. It will be realized. In particular, according to this tilt cab device, a large space is secured in the front lower part of the cabin, so that cooling air can be effectively introduced to the engine, radiator, etc. The degree of freedom in layout of ducts and cables will be improved.

<Example) Embodiments of the present invention will be described below based on the drawings.

As shown in FIGS. 1 and 2, a truck 1 to which the present invention is applied is provided with frames 2.2 extending in the longitudinal direction on both lower sides of the vehicle body, and a cabin is provided at the front of the frames 2, 2. 3 is installed, and a loading platform (not shown) is arranged behind the cabin 3 at the rear of the frame 2.2. A substantially triangular set bracket 4 is fixed to the lower front part of the cabin 3, and this bracket 4 is pivotally fixed to a support bracket 5 fixed to the upper surface of the front end of the frame 2. The cabin 3 is configured to swing around a pivot point (tilt center) X from a normal position to a forward tilted position.

Further, a tilt-up mechanism 6.6 is provided below the cabin 3 along both frames 2.2, and the cabin 3 is tilted by the tilt-up mechanism 6.6. As shown in FIGS. 3 and 4, this tilt-up mechanism 6 has a torsion bar 7 and a link mechanism 8 arranged in the front-rear direction along the inside of the frame 2, and the torsion bar 7 is located at the rear. The end is a fixed part A1, the front part is a torsion part B, and bearings provided at both ends are supported by the frame 2 via members 9.9. Further, the sunk mechanism 8 is composed of an upper arm 10, a lower arm 11, and a rod 12 extending in the vertical direction. One end of the upper arm 10 is fixed to the set bracket 4 and is swingable about the tilt center X like the set bracket 4, and the other end is connected to the upper end of the rod 12. ing. Further, one end of the lower arm 11 is fitted to the twisted portion B at the front end of the torsion bar 7, and is able to swing around the torsion bar 7, and the other end is connected to the lower end of the rod 12. There is. Therefore, when the cabin 3 that has been tilted forward is swung to the normal position, the upper arm 10 fixed to the set bracket 4 is swung in the direction a, and the rod 12 connected to the upper arm 10 is swung in the direction a.
moves downward, and the lower arm 11 is swung in the b direction, whereby the torsion bar 7 is twisted in the C direction at the torsion part B, and a gap is created between the fixed part A and the torsion part B of the torsion bar 7. Elastic energy from this twisting is stored.

The cabin 3, which has been swung to the normal position, is locked by a locking member (not shown) and held at the normal position.

Further, in this embodiment, in the fixed part A, the bearing of the torsion bar 7 is rotatably supported by a member 9, and in order to fix the torsion bar 7, the torsion bar 7 is rotatably supported by a member 9.
A fixed arm 13 is fixed to the rear end. As shown in FIG. 5, this fixed arm 13 is screwed with a bolt 14 that adjusts the amount of twist of the torsion bar 7 when the cabin 3 is set in the normal position. 2 by applying torsion bar 7
The uke is designed to stop the torsional reaction force.

According to the above configuration, when the cabin 3 is set to the normal position, the torsion bar 7 of the tilt-up mechanism 6 is twisted in the direction b and elastic energy is stored in the torsion bar 7, so that the cabin 3 is set to the normal position. When the retaining member is unlocked, the front end of the torsion bar 7 rotates in the counter-C direction due to the elastic energy stored in the torsion bar 7, and this rotation causes the lower arm 11 of the link mechanism 8 to rotate in the counter-C direction. to sway. Then, as the rod 12 moves upward, the upper arm 10 moves upward.
As a result, the cabin 3 is tilted to a forward tilting position via the set bracket 4 fixed to the upper arm 10.

Since the tilt-up mechanism 6 has a simple structure consisting of the torsion bar 7 and the link mechanism 8, it is possible to realize a tilt cab device that is inexpensive, has few failures, and is highly reliable.

In particular, since the torsion bar 7 is arranged along the frame 2 extending in the front and back direction on both left and right sides of the vehicle body, a large space free of obstructions is secured below the front of the cabin 3. . Therefore, the degree of freedom in the layout of ducts and cables, which are concentrated in the lower front part of the cabin 3, is improved, and the cooling f! The introduction of Jffl is performed well, and the required cooling performance for the engine is ensured.

Next, another embodiment of the present invention shown in FIG. 6 will be explained.
In this embodiment, a leaf spring 7' is used as a spring member in the tilt-up mechanism 6'.

That is, in this tilt-up mechanism 6', the frame 2
A rear end 7a' of a leaf spring 7' disposed in the front-rear direction along the inside of the frame 2' is fixed to a bracket 9' fixed to the frame 2', and a front end is fixed to a set bracket 4'. The link member 8' is connected to the link member 8'. When the cabin 3' that has been tilted forward is swung to the normal position, the link member 8' is moved to the tilt center X'.
The front part of the leaf spring 7' is bent downward by swinging in the direction d about the center of the leaf spring 7', and elastic energy is stored in the spring 7'.

According to such a configuration, when the locking member that locks the cabin 3' in the normal position is unlocked, the link member 8' is rotated by the elastic energy of the leaf spring 7'.
This causes the cabin 3' to be tilted to the forward tilting position.

Since they are arranged along the same line, a large space is secured below the front of the cabin 3'.

The tilt-up mechanism may be provided on both the left and right frames as shown in Figure 2, but it may also be provided on only one side depending on the weight of the cabin, the amount of elastic energy accumulated in the spring member, etc. .

[Brief explanation of drawings]

1 to 5 show a first embodiment of the present invention.
2 is a perspective view of the tilt cab device, FIG. 3 is an enlarged side view of the tilt cab device, and FIG. 4 is FIG. 3 IV-
FIG. 5 is an enlarged front view of the torsion amount adjusting member taken along line v--v in FIG. 3. FIG. Moreover, FIG. 6 is a side view of a tilt cab device showing a second embodiment. 2.2'...Frame member, 3,3'...Cabin, 6.6'...Tilt cab device (tilt up mechanism>, 7.7'...Spring member (torsion bar, leaf spring) , 8.8'...link member.

Claims (3)

[Claims] (1) A tilt cab device for an automobile whose cabin can be tilted forward, which is disposed in the front-rear direction along a frame member extending in the front-rear direction on the side of the vehicle body, and whose front end is connected to the cabin via a link member. A tilt cab device for an automobile, characterized in that the spring member is coupled to the frame member and has a rear end fixed to the frame member, and the spring member biases the cabin to tilt the cabin. (2) The tilt cab device for an automobile according to claim 1, wherein the spring member is constituted by a torsion bar. (3) The tilt cab device for an automobile according to claim 1, wherein the spring member is a leaf spring.