JP2012011966A - Cab tilt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make torsion adjustment of a torsion bar easy.SOLUTION: An arm 20 that extends toward the rear side of a vehicle from a base end which is rotatably fitted, with an axial center as the center and with its tip abutting with the bottom surface of a cab, as well as a lever which extends to the rear side of the vehicle from a base end, being fixed integrally along the arm 20 and being faced with a lower surface of the arm 20, are attached to a free end of a pair of torsion bars 18a and 18b, respectively. At the facing parts of the arm 20 and the lever, the torsion of the torsion bar 18a is transmitted to the arm 20 through the lever, with a bolt 24 that adjusts an angle formed by the lever and the arm 20 being intervened. By adjusting a clamping margin of the bolt 24, the lever rotates, with the axial center of the first and second torsion bars 18a and 18b as a center, to increase/decrease the torsion angle of the first and second torsion bars 18a and 18b.

Description

  The present invention relates to a cabbutyl device that assists in tilting a cab.

  Some cab-over type vehicles in which the engine room is located below the cab include a cab tilt device for tilting up the cab to improve engine maintainability, as described in Patent Document 1. The cabylt device is configured so that the cab can be tilted up with a small force by using torsion of two torsion bars arranged in the left-right direction of the frame.

  Here, torsion of the torsion bar occurs when the arm fixed to one end of the torsion bar is pushed down by the cab bottom surface during tilt down.

JP-A-6-8858

  By the way, the weight of the cab increases due to, for example, addition of optional parts, and the assist force required for tilting up changes, so it is necessary to adjust the torsion bar twist according to the cab weight.

  However, the torsion of the torsion bar is adjusted, for example, by interposing a spacer between the bottom surface of the cab and the arm, so that it takes a lot of time to arrange a spacer with a desired thickness and to install the spacer. Cost.

  Therefore, in view of the conventional problems as described above, the present invention is characterized by providing a carbitol device capable of easily adjusting torsion of a torsion bar.

  Therefore, the cabylt device according to the present invention is fixed to the pair of cab hinge brackets fixed to the left and right sides of the frame and the front lower surface of the cab so as to be separated from each other in the vehicle width direction. A pair of cab mount brackets attached to each other, and a first torsion bar whose one end is fixed to one cab hinge bracket so as not to be relatively rotatable and the other end is pivotally supported by the other cab hinge bracket. A second torsion bar whose one end is fixed to the other cab hinge bracket so as not to rotate relative to the other cab hinge bracket and is pivotally supported by the other cab hinge bracket; and other than the first and second torsion bars At the end, it extends from the base end, which is pivotally mounted about its axis, to the rear of the vehicle, and the tip contacts the cab bottom And a lever extending from the base end integrally fixed to the other end of each of the first and second torsion bars to the rear of the vehicle along the arm, at least a part of which is opposed to the lower surface or the upper surface of the arm Adjusting means for interposing the torsion bars of the first and second torsion bars to the arm via the lever and adjusting the angle formed by the lever and the arm, respectively, which are interposed in the opposing portions of the lever and the arm; It is characterized by including.

  According to the carbitol device of the present invention, it is possible to easily adjust the torsion of the torsion bar.

The perspective view which shows an example of 1st Embodiment of a carbylt apparatus. 1 is a cross-sectional view of the carbylate device of FIG. 1 as viewed from the front of the vehicle. The side view which looked at the carbylt device of Drawing 1 from the vehicle side Perspective view with arm mounted on lever Explanatory drawing showing the lever when the adjustment bolt is further rotated in the tightening direction Explanatory drawing showing the lever when the adjustment bolt is rotated in the loosening direction The perspective view which shows an example of 2nd Embodiment of a carbylt apparatus. Explanatory drawing of the main part when part of the lever faces the upper surface of the arm

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
1 to 4 show an example of a first embodiment of a cabylt apparatus.

  A pair of left and right cab hinge brackets 12 are fixed to the left and right side rails 10 constituting the ladder frame so as to face each other in front of the vehicle. A pair of cab mount brackets 16 are disposed on the front lower surface of the cab 14 at a predetermined distance in the vehicle width direction. Each of the cab mount brackets 16 is rotatably attached to a different cab hinge bracket 12. Between the left and right side rails 10, a first torsion bar 18a and a second torsion bar 18b are disposed. The first torsion bar 18a is rotatable to the cab hinge bracket 12b so that one end is fixed to the right cab hinge bracket 12a so as not to rotate relative to the other and the other end protrudes outward from the left cab hinge bracket 12b. Is pivotally supported. The second torsion bar 18b is pivotable to the cab hinge bracket 12 so that one end is fixed to the left cab hinge bracket 12b so as not to rotate relative to the other and the other end protrudes outward from the right cab hinge bracket 12a. Is pivotally supported.

  At the other end of the first and second torsion bars 18a and 18b, in order to push up the cab 14, respectively, an arm 20 that extends about the axis thereof and extends rearward of the vehicle is attached. In addition, at the other ends of the first and second torsion bars 18a and 18b, there are levers 22 extending along the arm 20 toward the rear of the vehicle in order to convert the torsion into a tilt-up assist force. It is fixed integrally.

  Specifically, the lever 22 extends from the middle in the axial direction to the rear of the vehicle among the cylindrical portion 22a that is coaxially fixed to the first and second torsion bars 18a and 18b and the outer peripheral surface of the cylindrical portion 22a. And an extending portion 22b to be extended. The cylindrical portion 22a may be integrally formed with the first and second torsion bars 18a and 18b.

The arm 20 includes a pair of side plate portions 20a and a connecting portion 20b.
The pair of side plate portions 20a has plate surfaces extending on substantially vertical surfaces with respect to the axial centers of the first and second torsion bars 18a and 18b, and sandwiches the extending portion 22b of the lever 22 from the left and right. Thus, it has the circular arc 20c which followed the outer peripheral surface of the cylindrical part 22a, and extends from here to the vehicle rear. And each arc 20c engages with the both sides of the extension part 22b from the lower part among the outer peripheral surfaces of the cylindrical part 22a.

  The connecting portion 20b connects at least portions of the upper ends of the pair of side plate portions 20a excluding at least the arc 20c. And the connection part 20b is contact | abutted with the bottom face (for example, rubber contact sheet) 14a of the cab 14 at the vehicle rear side. Further, the tip of the extending portion 22b of the lever 22 faces the lower surface of the connecting portion 20b.

  The bolt 24 that transmits the assist force of the lever 22 to the arm 20 has its shaft portion 24 a screwed into the tip of the lever 22, and the tip 24 b abuts on the lower surface of the connecting portion 20 b of the arm 20.

  The bolt 24 adjusts the angle formed by the lever 22 and the arm 20 according to the degree of screwing. For example, a straight line connecting the axis of the first and second torsion bars 18a, 18b and a specific point of the lever 22 (for example, the point farthest from the axis of the lever 22), and the first and second The angle α formed by the straight line connecting the axis of the torsion bars 18a and 18b and a specific point of the arm 20 (for example, the point farthest from the axis of the arm 20) is adjusted. The bolt 24 is preferably provided with means for preventing loosening (for example, a lock nut) in order to maintain the adjusted angle α.

  As shown in FIG. 5, when the bolt 24 is further rotated in the tightening direction, the lever 22 rotates in a direction away from the arm 20 (in the direction of the arrow in the drawing) according to the amount of rotation. Then, the torsion angles of the first and second torsion bars 18a and 18b are increased by the rotated angle Δα.

  On the other hand, as shown in FIG. 6, when the bolt 24 is rotated in the loosening direction, the lever 22 rotates in a direction approaching the arm 20 (in the direction of the arrow in the figure) according to the amount of rotation. . Then, the twist angle of the first and second torsion bars 18a, 18b is decreased by the rotated angle Δα.

  Note that the distal end portion 24b of the bolt 24 contacts the lower surface of the connecting portion 20b closer to the base end than the contact portion between the connecting portion 20b and the bottom surface 14a of the cab 14. Thereby, a part of the load of the cab 14 applied downward to the contact portion between the connecting portion 20b and the cab 14 is a circular arc on the opposite side of the contact portion with respect to the fulcrum, with the tip portion 24b of the bolt 24 serving as a fulcrum. Tell 20c upward force. Therefore, since the arc 20c is pressed against the cylindrical portion 22a of the lever 22, the arm 20 does not come off the lever 22 even if the center angle of the arc 20c is 180 ° or less.

  According to such a cabylt device, the lever 22 is rotated about the axis of the first and second torsion bars 18a, 18b by adjusting the tightening margin of the bolt 24, and only the angle Δα of the rotation is obtained. The torsion angle of the first and second torsion bars 18a and 18b can be increased or decreased. Accordingly, the torsion of the first and second torsion bars 18a and 18b can be easily adjusted with a slight increase in the number of parts without requiring a spacer, and a spacer having a desired thickness can be arranged. No great effort is required for the mounting work. In addition, since the lever 22 can be accommodated in the arm 20, an extra space under the bottom surface 14 a of the cab 14 is not required even when compared with a conventional carbylating device that does not use the combination of the lever 22 and the arm 20. .

  In addition, it can replace with the cylindrical part 22a fixed coaxially with the 1st and 2nd torsion bars 18a and 18b, and can also be set as a square cylinder part. In this case, a groove may be formed in the rectangular tube portion of the lever 22 following the arc 20c. Thereby, the lever 22 and the arm 20 can perform stable relative rotation while the side plate portion 20a having the arc 20c is fitted in the groove.

  Next, FIG. 7 shows an example of a second embodiment of the carbitol device. In addition, description is abbreviate | omitted about the part which overlaps with the content demonstrated in 1st Embodiment.

  In the present embodiment, the arm 20 and the lever 22 are attached in this order from the inside to a protruding portion in which the other ends of the torsion bars 18 a and 18 b protrude outward from the cab hinge bracket 12. The arm 20 is rotatably attached to the other ends of the first and second torsion bars 18a and 18b. The lever 22 extends from the proximal end integrally fixed to the other ends of the first and second torsion bars 18a, 18b along the arm 20 to the rear of the vehicle. A protruding portion 22 c that protrudes inward in the vehicle width is formed at the tip of the lever 22, and the upper surface of the protruding portion 22 c faces the lower surface of the arm 20. The shaft portion 24a of the bolt 24 is screwed into the protruding portion 22c, and the tip portion 24b comes into contact with the lower surface of the arm 20.

  Further, as shown in FIG. 8, regarding the positional relationship between the lever 22 and the arm 20, at least a part of the lever 22 may face the upper surface of the arm 20. In this case, for example, the shaft portion 24a of the bolt 24 has a through long hole 26 formed in the longitudinal direction of the lever 22 (less than the minimum diameter of the head portion of the bolt 24) so that the assist force of the lever 22 can be transmitted to the arm 20. It is only necessary to be inserted in the width) and screwed into the arm 20.

DESCRIPTION OF SYMBOLS 10 Side rail 12 Cab hinge bracket 14 Cab 14a Cab bottom surface 16 Cab mount bracket 18a, 18b Torsion bar 20 Arm 20a Side plate part 20b Connection part 20c Arc 22 Lever 22a Cylindrical part 22b Extension part 24 Bolt 24a Shaft part 24b Tip part

Claims (3)

A pair of cab hinge brackets fixed to the left and right of the frame,
A pair of cab mount brackets fixed to the front lower surface of the cab so as to be spaced apart from each other in the vehicle width direction and rotatably attached to different cab hinge brackets;
A first torsion bar having one end fixed to the one cab hinge bracket so as not to be relatively rotatable and the other end pivotally supported by the other cab hinge bracket;
A second torsion bar having one end fixed to the other cab hinge bracket so as not to rotate relative to the other cab hinge bracket and pivotally supported by the one cab hinge bracket;
An arm that extends from the proximal end pivotally attached to the other end of each of the first and second torsion bars to the rear of the vehicle, the tip of which contacts the cab bottom surface;
A lever extending from the base end integrally fixed to the other end of each of the first and second torsion bars to the rear of the vehicle along the arm, and at least a part of the lever facing the lower surface or the upper surface of the arm;
The lever and the arm are respectively opposed to each other, and the torsion of the first and second torsion bars is transmitted to the arm via the lever, and the angle formed by the lever and the arm is determined. Adjusting means for adjusting;
A cabylt device characterized in that it comprises a carburetor. The lever is
A cylindrical portion fixed coaxially with the other ends of the first and second torsion bars;
An extending portion extending from the middle in the axial direction to the rear of the vehicle in the outer peripheral surface of the cylindrical portion;
Comprising
The arm is
With respect to the axial centers of the first and second torsion bars, a plate surface extends on a substantially vertical plane, and the outer peripheral surface of the cylindrical portion is sandwiched between the extension portions of the lever from the left and right. A pair of side plate portions extending from here to the rear of the vehicle while having a copied arc;
Of the upper ends of the pair of side plate portions, a connecting portion that connects at least portions other than the arc, and
The carbitol device according to claim 1, comprising: At least a part of the lever faces the lower surface of the arm,
3. The cabylt device according to claim 1, wherein the adjustment unit includes a bolt in which a shaft portion is screwed to a tip of the lever and the tip is in contact with the arm.

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