JPS5911818Y2 - Mounting structure of torsion bar for tilting cab biasing - Google Patents

Description

[Detailed description of the invention] This invention is a tilt-type cab vehicle in which the driver's cab (hereinafter simply referred to as the cab) is pivotally attached to the frame so that the cab can tilt. The present invention relates to a mounting structure for a torsion bar that is biased in a direction.

Generally, in tractors, etc., the engine is placed below the cab, and the cab is pivoted to the frame so that it can be tilted in consideration of the maintainability of the engine. In order to reduce the operating force, a torsion bar is interposed between the cab and the frame to bias the cab in the tilting direction.

The torsion bar has one end fixed to the cab and the other end fixed to the frame on an axis along which the cab is pivoted to the frame, and obtains a biasing force against the cab by the torsional reaction force thereof.

By the way, with the above torsion bar, when the cab tilts to a predetermined tilting position (maximum tilting position), the torsional reaction force of the torsion bar becomes zero.
It is necessary to adjust the mounting position so that the cab assembly work can be facilitated and the locking stopper that stops the cab at the maximum tilt position can be made smaller.

Conventionally, this adjustment structure has a mounting lever fixed to the torsion bar, and a bolt is inserted into an arc-shaped long hole so that the mounting position can be adjusted by rotating around the torsion bar. A structure is adopted in which the angle is fixed at zero.

However, in the above-mentioned conventional torsion bar mounting structure, the mounting lever is fixed by simply tightening the long hole and the bolt, so when the cab is in a horizontal position, the torsion bar that biases the cab in the tilting direction is As the torsional reaction force acts to rotate the mounting lever, depending on the tightening force of the bolt, this torsional reaction force may cause the mounting lever to shift or the bolt to loosen, causing the torsion bar to become loose. There is a risk that the position adjustment may be deviated and the biasing force of the cab becomes insufficient, and at the same time, the pivot structure may come off.

Therefore, the present invention has been developed in view of these points, and the above adjustment position can be adjusted using a simple structure without compromising the ease of assembling the tilt-type cab and downsizing the stopper for stopping the tilting of the cab. It is an object of the present invention to provide a mounting structure for a torsion bar for biasing a tilt type cab, which can prevent the occurrence of displacement and loosening of bolts.

That is, in the present invention, in a torsion bar for biasing a tilting type cab, which is interposed between a frame and a tilting type cab pivotally attached to the frame and urging the cab in a direction to tilt, One end of the torsion bar is fixed to one of the frame and the cab, the other end of the torsion bar is fixed to a mounting lever, and an anchor portion for attaching the mounting lever to the other of the frame and the cab is shaped. One of the mounting lever and the anchor part is formed with an arc-shaped elongated hole and a circumferential wall, and a detent plate that engages with the circumferential wall is provided, and the detent plate has a center of the circumferential wall. A hole is opened at a more eccentric position, and a bolt is inserted through this hole and an elongated hole and screwed onto the other of the mounting lever and anchor part, so that the torsional reaction force of the torsion bar is applied during assembly. The force for rotating the mounting lever is supported by the engagement between the rotation prevention plate and the circumferential wall.

Hereinafter, the structure of the present invention will be explained based on drawings showing embodiments.

In the tilt-type cab vehicle shown in FIG. 1, reference numeral 1 denotes a cab forming a driver's cab, and the cab 1 is attached to left and right frames 2a and 2b extending downward in the front-rear direction with a front end pivoting portion 3.
The cab 1 is pivotably mounted at the pivot point 3, and the cab 1 is configured to tilt forward to a predetermined tilting position (maximum tilting position), as shown by the two-dot chain line, about the pivot portion 3.

As shown in FIGS. 2 and 3, the structure of the pivot portion 3 includes left and right cab mount brackets 4a and 4b fixed to the bottom surface of the cab 1, and left and right frames 2a and 2b.
Left and right frame brackets 5a, 5 fixed to the top surface of
A torsion bar 6 is interposed on the pivot axis between the shaft and the shaft.

In addition, the above left and right frame brackets} 5 a, 5 b
In addition to being directly connected to the frames 2a, 2b by mounting bolts 7, they are also connected and supported via auxiliary brackets 8 fixed to the frames 2a, 2b.

That is, one end 6a (left end in FIG. 2) of the torsion bar 6 is connected to the cab mount brackets 4a, 4.
It is inserted into a mount tube 9 that is fixed through the mount tube 9, and is fitted and fixed to a fitting portion 9a at one end (left end) of the mount tube 9.

On the other hand, the other end 6b of the torsion bar 6 (the right end in FIG.
It is fitted and fixed to the fitting part 10a at one end (right end) of the 0.

Fitting portion 9a at one end of the mount tube 9 and the other end 9
b is supported by the left and right frame brackets 5a and 5b via rubber pushers 11 and 11, respectively, and this structure allows the cab 1 (cab mount bracket 4
a, 4b) are tiltable around the mount tube 9, and the frames 2a, 2b (frame bracket 5a)
, 5b).

On the other hand, in the connecting tube 10, the other end 10b on the opposite side from the fitting part 10a is supported by the right frame bracket 5b, and the mounting lever 12 is integrally fixed to the other end 10b. has been done.

As shown in FIGS. 4 and 5, this mounting lever 12 has a generally elliptical upper portion with a through hole 12a through which the connecting tube 10 is fixed, and a lower portion with a through hole 12a. Arc-shaped long hole 1 centered on center point C1
2b has been established.

Further, a flange-shaped peripheral wall 13 is provided on the outer peripheral edge of the mounting lever 12, and around the lower elongated hole 12b, the peripheral wall 13 is held with a center point C2 at a position away from the elongated hole 12b upward. It is shaped like the side circumferential wall 13a.

Although the retaining side circumferential wall 13a is not completely circular, its center point C2 and radius are set so as not to interfere with the upper through hole 12a when a complete circle is drawn.

The mounting lever 12 is attached to the through hole 12 by tightening the adjustment bolt 15 inserted through the elongated hole 12 b to the anchor portion 14 formed on the right frame bracket 5 b.
The mounting angle is screwed so that the mounting angle can be freely determined around the center point C1 of H, that is, the torsion bar 6.

Further, when the mounting lever 12 is fixed to the anchor portion 14 with the adjustment bolt 15, it is fixed via a circular detent plate 16 that engages with the holding side circumferential wall 13a.

As shown in FIGS. 6 and 7, the rotation prevention plate 16 is
It has a flange-shaped engagement side circumferential wall 16a on its outer periphery, and a hole 16b for inserting the adjusting bolt 15 is opened at a position eccentric from the center point C3 of the engagement side circumferential wall 16a.

The retaining side circumferential wall 16a engages inwardly with the retaining side circumferential wall 13a of the mounting lever 12, and the center points C2 and C3 of both circumferential walls 13a and 16a coincide, The inner circumferential surface of the retaining side circumferential wall 13H and the outer circumferential surface of the engaging side circumferential wall 16a are shaped to have substantially the same diameter so that they are in close contact with each other.

Further, the bolt insertion hole 16b of the rotation stopper plate 16 is provided so that its eccentricity is approximately the same as the distance between the center point C2 of the circumferential wall 13a of the mounting lever 12 and the elongated hole 12b. Hole 12b matches and bolt 15 is attached to both.
can be inserted.

The mounting lever 12 is attached to the bolt 1 together with the rotation stopper plate 16.
5 to the anchor part 14, the cab 1 is positioned in the first
When the torsion bar 6 is tilted to the maximum tilting position shown by the two-dot chain line in the figure, the torsion reaction force of the torsion bar 6 is set to zero, that is, the hole 1 b and the elongated hole 12b, the bolt 15 is inserted through both JL16b, 12b, and is tightened and fixed to the anchor part 14.

When the cab 1 is changed from this tilted state to a non-tilted state (horizontal state), the torsion bar 6 is fixed to the right frame bracket 5b via the mounting lever 12 and the connecting tube 10, and One end 6a fixed to the cab mount brackets 4a, 4b via the mount tube 9 rotates with the rotation of the cab 1, and the torsion bar 6 is twisted, so that the torsion reaction force is applied to the cab 1. This biases the body in the tilting direction (lifting direction).

As mentioned above, when the cab 1 is in the horizontal state, the torsional reaction force generated in the torsion bar 6 acts on the mounting lever 12 as a rotational force (counterclockwise in FIG. 3), and the bolt 15 relative to the elongated hole 12b However, the mounting lever 12 receives a force that shifts the tightening position of the circumferential wall 1.
3a and 16a, the force acting on the mounting lever 12 is reduced by the engagement between the retaining side circumferential wall 13a and the engaging side circumferential wall 16a. Therefore, the initial positioning angle of the mounting lever 12 is maintained, and the bolt 15 does not loosen.

Also, since the hole 16b of the rotation stopper plate 16 is eccentric from the center point C3 of the circumferential wall 16a, relative rotation of the mounting lever 12 with respect to the holding side circumferential wall 13a is prevented in response to adjustment of the mounting position of the mounting lever 12. By changing the position, the arc-shaped elongated hole 12b and the hole 16b of the detent plate 16 can be easily matched.

In the above embodiment, the mounting lever 12 is fixed to the anchor portion 14 of the frame bracket 5b on the frame 2b side, but the mounting lever 12 is fixed to the cab mount bracket 4a, 4b, etc. on the cab 1 side. It is also possible to attach it to an anchor section shaped like this, and to position it using the attachment section on the side of the cab 1.

Further, the rotation prevention plate 16 is also attached to the mounting lever 12 by the circumferential wall 13a,
16a, but the locking plate 16 may be engaged with the anchor portion 14 through the circumferential wall to maintain the position of the mounting lever 12. In this case, the anchor portion A long arc-shaped hole is provided in 14 to attach the mounting lever 12.
All you have to do is position it.

Further, in the above embodiment, the frames 2a, 2b and the frame brackets 5a, 5b are formed as separate bodies or are connected together, but the two may be integrated in advance. The same applies to the cab mount brackets 4a and 4b on the cab 11 side.

As described in detail above, according to the present invention, a tilt-type cab is provided between a frame and a tilt-type cab that is tiltably pivoted to the frame, and biases the cab in the direction of tilting. One end of the torsion bar is fixed to one of the frame and the cab, the other end of the torsion bar is fixed to a mounting lever, and the mounting lever is fixed to the other of the frame and the cab. An anchor part to which the mounting lever is attached is formed, an arcuate long hole and a circumferential wall are formed in one of the mounting lever and the anchor part, a detent plate that engages with the circumferential wall is provided, and the detent plate is provided with a detent plate that engages with the circumferential wall. A hole is opened at a position eccentric from the center of the circumferential wall, and a bolt is inserted through this hole and a long hole and screwed to the other of the mounting lever and anchor part, so that the tilt-type cab can be assembled. With a simple structure, it is possible to reliably prevent mounting lever positional displacement and bolt loosening caused by torsional reaction force of the torsion bar, while making the cab tilting stopper more compact.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention, with FIG. 1 being a side view of the main parts of a tilt-type cab vehicle, and FIG. 2 being a longitudinal cross-sectional front view of the pivot joint.
Fig. 3 is a right side view of the pivot joint, Fig. 4 is a front view of the mounting lever, Fig. 5 is a central vertical sectional view of the mounting lever, Fig. 6 is a front view of the detent plate, and Fig. 7. is a central vertical cross-sectional view of the same detent plate. 1... Cab, 2a, 2b... Frame, 3... Curved joint, 4a, 4b... Cab mount bracket, 5a, 5b... Frame bracket, 6...Torsion bar 6a...
...One end, 6b...Other end, 7...Mounting bolt, 8...Auxiliary bracket, 9...
...Mount tube, 9a...Mating part, 9b
......Other end, 10...Connection tube,
10a...Fitting part, 10b...Other end, 11...Rubber push, 12...
・Mounting lever, 12a...Through hole, 12b
...Long hole, 13 ... Peripheral wall, 13 a.
...Circumferential wall, 14...Anchor part, 15.
...Bolt, 16... Rotation stopper plate, 16
a... Circumferential wall, 16b... Hole.

Claims (1)

[Scope of utility model registration request] In a torsion bar for biasing a tilt-type cab that is interposed between a frame and a tilt-type cab that is pivotally connected to the frame and that biases the cab in a direction in which the cab is tilted, one end of the torsion bar is connected to the The torsion bar is fixed to one side of the frame and the cab, the other end of the torsion bar is fixed to a mounting lever, and the other end of the frame and the cab is formed with an anchor portion to which the mounting lever is attached. An arc-shaped elongated hole and a circumferential wall are formed on one side of the anchor part, a detent plate that engages with the circumferential wall is provided, and a hole is provided in the detent plate at a position eccentric from the center of the circumferential wall. 1. A torsion bar mounting structure for biasing a tilt-type cab, characterized in that a bolt is inserted through the hole and the long hole and screwed to the other of the mounting lever and the anchor portion.