JPS6036525Y2 - Tail cab front mount device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a front mount device for a tilt cab used in large and medium-sized trucks.

When the cab of a cab-over vehicle is made tiltable, there is an advantage that the maintainability of the engine and the like can be improved.

To this end, conventionally, the cab hinge bracket attached to the frame and the cab-side bracket are pivotally connected, and the rotational force of a torsion bar is applied to the cab-side bracket to reduce the force required to tilt the cab.

However, in a device that uses such a torsion bar, even if the front mount device is made fully floating, the frame side and the cab side are connected via the torsion bar, so the vibration isolation effect of making the front mount device fully floating is not effective. There was a drawback that the amount was reduced by half.

For this reason, expensive hydraulic jacks, etc., have been used in place of torsion bars for full-float front mount devices, but such hydraulic jacks are not only expensive, but also require maintenance of the device.・There was a drawback that inspection performance was also deteriorated.

The present invention was developed in view of the above, and aims to improve the ride comfort and maintainability of the cab by providing a front mount device with a high shock absorbing effect while using a torsion bar that is simple in structure and inexpensive. purpose.

The present invention will be described below with reference to an illustrated embodiment.

In the figure, 1a is a side member of the truck frame 1, and a cross member 1b connects the front ends of the side member 1a.
A cab hinge bracket 3 is attached to the top surface of both ends of the cab via a rubber cushion 2.

Reference numeral 4 denotes a cab-side bracket fixed to the lower surface of the cab 5, and a hinge pin 6 fixed to this bracket 5 is pivotally supported by the cab hinge bracket 3, so that the cab 5 is mounted so as to be tiltable forward.

Here, in the cab 5, a bracket 7 fixed to the cross member 1b and a hinge pin 6 are pivotally connected by a torque rod 8 extending in the front-rear direction, so that free movement in the front-rear direction is restricted, and the free movement of the cross member 1b is restricted. A bracket 9 fixed to the upper surface and the floor surface of the cab 5 are connected by a lateral rod 10 extending in the left-right direction, so that automatic movement in the left-right direction is restricted.

That is, the direction in which the rubber cushion 2 is allowed to move is regulated by the torque rod 8 and the lateral rod 10.

The base end arm portion 1 of the torsion bar 12 is supported by the bracket 9 and the torsion bar bracket 11.
2a is brought into contact with and locked to the rear surface of the cross member 1b, and the tip of the torsion bar 12 and the hinge pin 6 fixed to the cab side bracket 4 are connected via the universal joint 13. to lift and energize cab 5.

In the above configuration, the cab 5 has a torsion bar 12
Since the rotational force is transmitted through the universal joint 13, if the engagement by the rear mount device (not shown) is released, the cab 5 can be easily tilted with the help of the rotational force transmitted from the torsion bar 12. be able to.

Further, since the rear end of the cab 5 is normally secured to the frame 1 via a rear mount device (not shown), the cab 5 maintains a substantially horizontal state.

Here, a cab hinge bracket 3 that supports the front end of the cab 5 is attached to the frame 1 via a rubber cushion 2.

Further, since the frame 1 and the cab 5 are connected via the torque rod 8 and the lateral rod 10, the cab 5
The torsion bar 12 does not vibrate in the front-rear and left-right directions, but only in the vertical direction.The tip of the torsion bar 12, whose base end is abutted against the frame 1, and the cab 5 are connected to a universal joint 13. Since the hinge pin 6 fixed to the cab-side bracket 4 and the torsion bar 12 are constrained to each other in the rotational direction, they can freely move in the vertical direction.

Therefore, even if the cab is lifted and energized by using a simple and inexpensive torsion bar instead of an expensive hydraulic jack, the vibration transmission path between the cab and frame can be cut off, resulting in a comfortable cab ride. There is no risk of deterioration.

In the embodiment, a pair of left and right torsion bars are provided to prevent twisting of the cab 5, but when the left and right width of the cab 5 is small or when the rigidity of the cab 5 is sufficiently high, a single torsion bar is provided. It is also possible to use a chisel to apply lifting force to only one cab-side bracket.

Further, as a cushion for attaching the cab hinge bracket 3 to the frame 1, in addition to the rubber cushion shown in the embodiment, a spring or the like may be used, and if necessary, a shock absorber may be used between both ends of the cushion. You can also combine them.

As explained above, according to the present invention, it is possible to cut off the vibration transmission path between the cab and the frame without using a torsion bar, which has a simple structure and is inexpensive. It can improve your comfort.

[Brief explanation of drawings]

FIG. 1 is a plan view of essential parts showing an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a side view of the same. 1... Frame, 2... Rubber cushion, 3... Cab hinge bracket, 4...
... Cab side bracket, 5 ... Cab,
6...Hinge pin, 8...Torque rod, 10...Lateral rod, 12...
・Torsion bar 13...Universal joint.

Claims (1)

[Scope of utility model registration request] The cab side bracket is pivotally attached to the cab hinge bracket attached to the frame via a cushion, and the cab and frame are connected via a torque rod and a lateral rod to restrict the free movement of the cab in the longitudinal and lateral directions. A front mount device for a tilt cab, characterized in that the tip of a torsion bar whose reaction force is supported by a frame and a cab-side bracket are connected via a universal joint to lift and bias the cab.