JPH0611909Y2 - Cab tilt device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a cab tilt device for a tilt cab vehicle, and more particularly to a structure of a torsion bar receiving portion thereof.

[Prior Art] In a tilt cab vehicle, the twisting force of a torsion bar is used to maintain the tilted posture of the cab during tilting. That is, the cab floor on the cab side is pushed upward by the torsion bar arm of the torsion bar fixed to the chassis side, and the cab is held in a tilted state. As a cab tilt device using such a torsion bar, for example, Jikho Sho 61-3
The one shown in Japanese Patent No. 6459 is known.

FIG. 4 shows the main part of this type of tilt cab device.

As shown, the torsion bar 22 is fixedly mounted on the tilt bracket 21A provided on the chassis frame 21,
The state (A) shows a state in which a cab (not shown) is tilted up, and the state (B) shows a state in which the cab is tilted down. The cab was tilted up (A)
In this state, the cab floor 23 on the cab side receives the torsion bar arm 22A via the torsion bar receiving portion 24.
Supported by the tip of.

[Problems to be solved by the device]

By the way, the cab is in the state of being tilted up (A) only when inspecting the engine, but at other times,
The cab is in a tilted down (B) state. Therefore, the torsion bar 22 is almost in a twisted state and is subjected to a twisting force for a long time. Therefore, the torsion bar 22 may sag during a long period of time, and the position of the torsion bar arm 22A in the free state becomes the position indicated by the chain double-dashed line. Therefore, the torsion torque of the torsion bar 22 is reduced, and the operating force for tilting up the cab is increased.

The present invention has been made to solve the above-mentioned problems, and the purpose thereof is, even if the torsion bar is worn out,
To provide a cab tilt device capable of tilting up a cab with a predetermined operation force without reducing a torsion torque of a torsion bar when the cab is tilted.

[Means for Solving the Problems]

To achieve the above object, the present invention relates to a cab tilt device for supporting a cab floor on a cab side through a torsion bar receiving portion on a torsion bar arm of a torsion bar fixed on the chassis side. A cab floor support portion that is in contact with or fixed to the cab floor is formed in each of the upper and lower portions of the above, and a torsion bar arm contact portion is provided between the support portions at positions different from each other.

[Action]

In the present invention, even if the torsion bar is worn out, the distance from the cab floor to the torsion bar arm abutting part can be changed by extending the torsion bar receiving part in an inverted state. By doing so, the same effect as that when the torsion angle of the torsion bar is relatively increased is produced.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show the contents of a cab tilt device according to an embodiment of the present invention.

In FIG. 2, reference numeral 1 is a chassis frame, and a torsion bar 2 is rotatably fixed to a tilt bracket 1A provided on the chassis frame 1. 3 is an arm of the torsion bar 2, 4 is a cab floor, and 5 is a torsion bar receiving portion.

As shown in FIG. 1, the torsion bar receiving portion 5 includes a box-shaped body 6 and a torsion bar arm contact portion 7. Cab floor support portions 6A and 6B fixedly attached to the cab floor 4 on the upper and lower surfaces of the box-shaped body 6, respectively.
Are formed. The torsion bar arm contact portion 7 is
The roller 8 is rotatably supported by a shaft 8 fixed to the box-shaped body 6, is located between the cab floor support portions 6A and 6B, and has a different distance from them. That is, if the distances from the cab floor support portions 6A and 6B to the central axis of the torsion bar arm contact portion 7 (corresponding to the central axis of the shaft 8) are "a" and "b", respectively, b> a It has a relationship of.

When the cab is tilted up, the arm 3 of the torsion bar 2 is in the state (A), and when the cab is tilted down, the arm 3 of the torsion bar 2 is in the state (B).

Then, normally, the cab floor 4 has a cab floor supporting portion 6A of the torsion bar receiving portion 5 fixed thereto by a bolt (not shown), and fixed from the cab floor 4 to the center of the torsion bar arm contact portion 7. The distance to the axis is "a".

As shown in FIG. 3, if the arm 3 of the torsion bar 2 should be depressed, it will be in a two-dot chain line. in this case,
Turn the torsion bar receiving part 5 upside down,
And the cab floor support portion 6B of the torsion bar receiving portion 5
Attach with a bolt to fix. As a result, the distance from the cab floor 4 to the central axis of the torsion bar arm abutting portion 7 becomes "b". Therefore, the distance from the cab floor 4 to the central axis of the torsion bar arm abutting portion 7 becomes "b- a "is increased. Therefore, in this case, the same effect as that of the torsion angle of the torsion bar 3 is relatively increased, the force by which the cab floor 4 is pushed from the tip of the arm 3 is increased, and a predetermined torsion torque is maintained. It

In short, when the cab is tilted, the torsion torque of the torsion bar 2 is not reduced and a predetermined tilt operation force can be maintained.

In the present embodiment, the torsion bar arm contact portion 7 is composed of a roller rotatably supported by the box-shaped body 6, but the present invention is not limited to this case, and for example, the box-shaped body 6 has a cross section. It can also be configured by fixing a circular rod.

In addition, in this embodiment, the torsion bar arm contact portion 7 is fixed to the cab floor 4 with bolts.
Without being limited to such a case, the torsion bar arm contact portion may be detachably attached to the tip of the arm 3 without being fixed to the cab floor 4.

[Effect of device]

As described above, according to the cab tilt device according to the present invention, even if the torsion bar is depressed, the distance from the cab floor to the torsion bar arm abutting part can be increased by reversing the torsion bar receiving part. Can be changed to be longer. By doing so, the same effect as that when the torsion angle of the torsion bar is relatively increased is produced. Therefore, when the cab is tilted, the torsion torque of the torsion bar is not reduced, and a predetermined tilt operation force can be maintained.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a cab tilt device according to an embodiment of the present invention, FIG. 2 is a side view of the cab tilt device, and FIG. 3 is a cab tilt device when the torsion bar receiving part is reversed. A side view and FIG. 4 are side views of a conventional cab tilt device. 1 ... Chassis frame 2 ... Torsion bar 3 ... Arm 4 ... Cab floor 5 ... Torsion bar receiving section 6A, 6B ... Cab floor support section 7 ... Torsion bar arm contact section

Claims (1)

[Scope of utility model registration request] 1. A cab tilt device in which a cab floor on the cab side is supported by a torsion bar arm of a torsion bar fixedly mounted on the chassis side via a torsion bar receiving portion, and the cab floor is provided above and below the torsion bar receiving portion, respectively. A cab tilting device, characterized in that a cab floor support portion that comes into contact with or is fixed to a cab floor support portion is formed, and a torsion bar arm contact portion is provided between the support portions at positions different from each other.