JPS6129592Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cab tail device that is applied to a cab over truck or the like.

In cab-over type trucks, etc., the cab that covers the top of the engine may be tilted to improve engine inspection and maintenance.

Conventional cab tailing devices of this type connect the cab and frame via a hydraulic cylinder, and operate a lever or switch by driving a hydraulic pump connected to the hydraulic cylinder via a switching valve, etc. The cab is configured so that the cab can be tilted from the normal position to the tilted position, or the cab that has been tilted can be rotated back to the normal position. In such a cab tilt device, when the cab is deflected to its normal position, the cab and the frame are directly connected by a hydraulic cylinder, so there is a problem in that vibrations of the frame are transmitted to the cab, impairing riding comfort.

Therefore, in order to solve this problem, in the conventional cab tailing device, a relief passage is provided to communicate the piston chambers on both sides of the hydraulic cylinder with each other to perform lost motion, and the hydraulic cylinder is set in a free state and the cylinder is moved. When it comes to cabling, I actually try to separate it.

However, during such a conventional cab tail operation, the pressure on the high pressure side escapes to the low pressure side through the relief passage, resulting in a drawback that energy loss occurs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cab tailing device for a truck that can eliminate the drawbacks of the prior art and ensure a comfortable ride without energy loss.

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

1 to 3 show an embodiment of the present invention. This cab tailing device connects a cab 3, which is mounted on the front part of a frame 2 that supports a truck bed 1 so as to be tilted forward and fixed, to the frame 2 via a hydraulic cylinder 4, and the cylinder 4 is operated to extend and retract. to lift and rotate the cab 3 from the normal position to a predetermined tilted position,
Alternatively, it can be rotated back from the tilted position to the normal position. By removably coupling the rear end of the cab 3 to a rear arch 5 provided on the frame 2 via a cab lock mechanism 7 that is operated by a cab lock handle 6, the cab 3 is stabilized in its normal position. I'm trying to support it. A cab hinge bracket 8 is fixed to the frame 2, and one end of a cab hinge arm 9 is pivotally supported on this bracket 8. A bracket 10 fixed to the lower end of the cab 3 is rotatably coupled to the free end of the arm 9. A linking part 11 is formed in this bracket 10, and this linking part 11 is connected to the piston head 16 of the hydraulic cylinder 4.
Its coordinating abutment surface is formed into a substantially semicircular concave shape and faces the head 16 so that it can be engaged and detached from the head 16. A bin 12 for preventing overtail is protruded near the linking part 11 of the bracket 10.

A hydraulic cylinder hinge bracket 13 is fixed to a position near the bracket 8 of the frame 2, and the base end of the hydraulic cylinder 4 is rotatably supported on this bracket 13. A spring 14 is interposed between the bracket 13 and the cylinder 4, and this spring 14 urges the cylinder 4 to press against the stopper 15. The tip end surface of the piston head 16 of the cylinder 4 is formed into a substantially semicircular convex shape so as to be removably connected to the linking part 10 of the bracket 10. A wire 1 is hung across a pin 17 protruding from the tip and a linking part 10.
8, the cylinder 14 and bracket 10 are held together with a margin. An engagement groove 19 is formed near the tip of the piston head 16, into which a pin 12 protruding from the bracket 10 can be fitted.

Note that 20 is a spring that supports the front load of the cab 3, 21 is a shock absorber connected in parallel to this spring 20, and a rear load supporting spring (not included) that is incorporated in series in the cab lock mechanism 7, etc. (Illustrated) and cab 3
The structure is such that it can be stably supported floating in the normal position.

In the cab tailing device for a truck having the above structure, when the cab 3 is in the normal position, the cab 3, the frame 2, and the hydraulic cylinder 4 are in the state shown in FIG. 2, and the tip of the piston head 16 of the hydraulic cylinder 4 is is the cooperation part 11 of the bracket 10
They are separated from each other with an appropriate gap and are facing each other. Therefore, the frame 2 and the cab 3 are separated by this gap at the cylinder 4, and even if the vibrations of the frame 2 are transmitted to the cylinder 4, the vibrations of the cylinder 4 are blocked by this gap. and the bracket 10, that is, the cab 3
is not transmitted. The cab 3 does not receive vibrations from the frame 2 through the cylinder 4, and is floatingly supported on the frame by the spring 20, shock absorber 21, etc., so the ride inside the cab 3 is comfortable. Become. An appropriate gap size between the piston head 16 and the linking part 11 may be the minimum size that can absorb and block the maximum amplitude of the frame 2.

When hydraulic pressure is pumped into the cylinder 4 to overturn the cab 3, the piston head 16 moves up the gap toward the linking part 11 of the bracket 10 and comes into contact with the linking part 11, and by elongation after contact, Cooperation department 1
Push up 1 and gradually tilt cab 3. When the cab 3 is tilted to a predetermined angle, the pin 12 of the bracket 10 fits into the engagement groove 19 of the piston head 16, as shown in FIG. Head 1
6, it is in a connected state in which free movement in the forward direction is prevented, and therefore overtilt is prevented.

When pressure is forced into the cylinder 4 to return the tilted cab 3 to its original normal state, the piston shortens. At this time, the piston head 16 and the cab 3
Since the cab 3 is connected by the engagement groove 19 and the pin 12, the cab 3 is rotated upward during the initial shortening operation. After the cab 3 has rotated to the top dead center, the tip end surface of the piston head 16 is in contact with and supported by the linking part 11 of the bracket 10 from below, so the cab 3 is supported by the piston of the cylinder 4. It is rotated downward in the state where it is held, and gradually descends to the normal position. Even after the cab 3 returns to its normal position, the cylinder is slightly shortened, and the piston head 16 separates from the linking portion 11 to form the gap, returning to the state shown in FIG. 2.

Note that during the above operation, the spring 14 interposed between the base end of the cylinder 4 and the bracket 13,
The cylinder 4 is constantly urged upward so that the piston head 16 of the cylinder is reliably linked to the linking part 11 of the cab bracket 10. Further, the wire 18 that wraps the piston head 16 and the linking part 11 together with a margin has the function of ensuring the above-mentioned linkage, and also serves as an assistant.

As explained above, according to the present invention, a gap is normally provided between the cab and the cylinder that is interposed between the cab and the frame and performs the cab tilt operation, so this gap allows the cylinder to move from the frame to the cylinder. It is possible to block the transmitted vibrations from being transmitted to the cab, improving the riding comfort in the cab, and also eliminating the need to provide a relief path in the cylinder itself to cause lost motion. It is possible to obtain effects such as eliminating pressure loss and making it possible to downsize the cylinder. In addition, the cab locking device and the wire 19 serve to prevent the cab from tipping forward in the event that it comes off.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is an overall side view, and FIGS. 2 and 3 are enlarged partial sectional views in normal state and in tilted state. 2... Frame, 3... Cab, 4... Hydraulic cylinder, 7... Cab block mechanism, 8, 10, 1
3... Bracket, 9... Cab hinge arm,
DESCRIPTION OF SYMBOLS 11... Linkage part, 12... Pin, 14... Spring, 15... Stopper, 16... Piston head, 17... Pin, 18... Wire, 19... Engagement groove.

Claims (1)

[Scope of utility model registration request] In a cab tilt device for a truck, a frame and a cab tiltably mounted on the frame are connected via a hydraulic cylinder, and the cab is tilted by extending the hydraulic cylinder, and one end of the hydraulic cylinder is connected to the cab tilting device. is rotatably supported on the frame, the free end of the cylinder is removably attached to a part of the cab, and the two are loosely connected by a wire;
A cab tailing device for a truck, characterized in that a gap is formed between the cab and a hydraulic cylinder when the cab is in a normal state.