JPH1086859A - Stopper device of cab tilt mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably prevent a descent of a cab, simplify a structure, and reduce weight and cost by interposing a stopper member between both brackets at tilt time of the cab. SOLUTION: A block-shaped engaging member 43 is installed on the tip of a stopper member 37. On the other hand, a bracket 45 molded in a cross-sectional almost U shape is protrusively arranged in the cylinder tube 27 direction along a piston rod 31 in a fixing member 33. A U-shaped notch 47 into which the stopper member 37 rotated in the A direction with a bracket 39 as the rotational center can be inserted, is arranged in opposed two pieces 45a and 45b of the bracket 45, and when a cab is tilted by elongating a piston rod 31, the stopper member 37 rotated in the A direction is inserted into the notch 47, and when the engaging member 43 on its tip is engaged between the two pieces 45a and 45b, a descent of the tilted cab can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a stopper device for a cab tilt mechanism in a cab-over type truck, and more particularly to a stopper device for a hydraulic cab tilt mechanism using a hydraulic cylinder.

[0002]

2. Description of the Related Art Conventionally, a cab-over type truck is equipped with a cab-tilt mechanism in order to provide services such as engine inspections. In particular, in double cabs and large vehicles, a hydraulic cab-tilt mechanism using a hydraulic cylinder is widely used. Have been. In this type of hydraulic cab tilt mechanism, a security valve is mounted on the hydraulic system to prevent the cab from lowering during tilting.
In addition to such a structure, conventionally, a mechanical stopper device such as that disclosed in Japanese Utility Model Laid-Open No. 4-1148891 is mounted on this type of cab tilt mechanism to enhance its safety.

FIG. 5 to FIG.
FIG. 1 shows a stopper device disclosed in Japanese Patent Application Publication No. JP-A-2003-115, which is rotatable at the tip end of a piston rod 9 pivotally attached to a cab 3 of a cylinder device 7 mounted between a cab 3 and a frame 5. To the piston rod 9
The side end is formed in a channel shape and the cylinder tube 1
(1) A stay 13 attached to the outer periphery, a plurality of ratchet-shaped teeth 15 arranged in an axial direction at an opening end of the stay 13, and a stay 13 and a cylinder tube 11 outside the cylinder tube 11. A stopper guide 17 that covers the overlapped portion of the stay and is arranged at least close to the outer peripheral surface of the stay 13 and fixed to the cylinder tube 11;
One end is rotatably supported by the stopper guide 17 and a lever stopper 23 having a free end formed with a claw 21 capable of engaging with the teeth 15 and the end face 19 of the stay 13.

When the cab 3 is tilted, the pawl 21 of the lever stopper 23 is moved to the end face 19 of the stay 13 and the teeth 15.
, The cab 3 is prevented from lowering.

[0005]

However, since the stopper device 1 has a large number of parts and a complicated structure, the cost and weight of the stopper device 1 are increased.

For this reason, there has been a demand for a stopper device for a cab tilt mechanism which has a sufficient function, has a simple structure and reduces weight and cost. The present invention has been devised in view of the above circumstances, and provides a stopper device for a cab tilt mechanism that reliably prevents the cab from lowering when the cab is tilted, has a simple structure, and can reduce the weight and the cost. The purpose is to:

[0007]

In order to achieve the above object, a stopper device for a cab tilt mechanism according to a first aspect of the present invention includes a cylinder tube of a hydraulic cylinder of a hydraulic cab tilt mechanism pivotally mounted between a cab and a frame. Brackets are respectively provided on the outer periphery and on the tip end side of the piston rod, and a stopper member is interposed between both brackets when the cab is tilted.

[0008] The invention according to claim 2 is based on claim 1.
In the stopper device of the cab tilt mechanism described above, the stopper member is made of a round bar-shaped steel material rotatably mounted on a bracket provided on the outer periphery of the cylinder tube, and when the cab is tilted, its tip is on the piston rod side. According to a third aspect of the present invention, in the stopper device according to the first aspect, the stopper member is pivotally attached to a bracket provided on an outer periphery of the cylinder tube. It is made of a steel material having a substantially U-shaped cross section, and is characterized in that its tip is fixed to a bracket on the piston rod side via a fixing pin when the cab is tilted.

According to a fourth aspect of the present invention, in the stopper device for a cab tilt mechanism according to the first aspect, the stopper member is detachable from a bracket provided on an outer periphery of the cylinder tube and a distal end side of the piston rod. It is characterized by a round bar-shaped steel material.

According to the first aspect of the present invention, the bracket is provided on the outer circumference of the cylinder tube and on the tip end side of the piston rod after the cab is tilted by extending the piston rod of the hydraulic cylinder for inspection of the engine or the like. If a stopper member is interposed therebetween, the stopper member prevents the contraction of the piston rod and prevents the tilted cab from descending.

To return the cab to its original position, the stopper member is removed from between the brackets and the piston rod of the hydraulic cylinder is contracted. Claims 2 and 3
In the invention according to the present invention, after the piston rod is extended to tilt the cab, the stopper member is rotated toward the distal end of the piston rod and engaged with the bracket on the piston rod side, or fixed with a fixing pin. The stopper member prevents the cab from lowering by preventing the piston rod from contracting.

To return the cab to its original position, the stopper member is rotated in the opposite direction to release the engagement with the bracket, or the fixing pin is removed to release the fixing between the bracket and the stopper member. The piston rod may be contracted. Further, in the invention according to claim 4, after the piston rod is extended and the cab is tilted, the stopper member is engaged between the outer periphery of the cylinder tube and a bracket provided on the distal end side of the piston rod. Prevents the piston rod from contracting and the cab from lowering.

To return the cab to its original position, the stopper member is removed from the bracket and the piston rod is contracted.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 and 2 show an embodiment of a stopper device according to claims 1 and 2. In the drawings, reference numeral 25 denotes a hydraulic pressure of a hydraulic cab tilt mechanism disposed between a cab (not shown) and a frame. The hydraulic cylinder 25 is pivotally attached to the cab and the frame via a fixing member 29 having a substantially T-shaped cross section mounted on the lower portion of the cylinder tube 27 and a cylindrical fixing member 33 provided at the tip of the piston rod 31. Have been.

Then, as in the prior art, the piston rod 31
The cab tilts due to the extension of the cab, and the cab tilts down in the frame direction by the contraction of the piston rod 31 into the cylinder tube 27. Thus, in the present embodiment, in addition to the same configuration as the conventional one, a stopper device 35 for preventing the cab from lowering at the time of tilting is mounted between the cylinder tube 27 and the piston rod 31. .

That is, in FIG. 1, 37 is the cylinder tube 2
7 is a stopper member made of a round bar-shaped steel material rotatably mounted in the directions of arrows A and B via two brackets 39 erected on the outer periphery of the cab 7 when the cab shown in FIG. The tip end of the stopper member 37 is sandwiched between two elastic pieces 41 mounted on the outer periphery of the rear end side of the cylinder tube 27.

At the tip of the stopper member 37, a block-shaped engaging member 43 is attached. on the other hand,
A bracket 45 having a substantially U-shaped cross section is provided on the fixing member 33 so as to project toward the cylinder tube 27 along the piston rod 31. The two opposite pieces 45a and 45b of the bracket 45 are provided with the stopper member 3 that has turned in the direction of arrow A with the bracket 39 as the center of rotation.
U-shaped notches 47 and 49 into which the cab 7 can be inserted are provided. When the cab is tilted by extending the piston rod 31 as shown in FIG. By inserting the member 37 into the notch 47 and engaging the engaging member 43 at the tip thereof between the two pieces 45a and 45b, the tilted cab is prevented from lowering.

Since the structure of the hydraulic cab tilt mechanism itself is the same as that of the conventional tilt mechanism, its description is omitted here. Since the stopper device 35 according to the present embodiment is configured as described above, the stopper member 37 is sandwiched between the two elastic pieces 41 as shown in FIG. It is held on the outer periphery of the cylinder tube 27.

Then, after the piston rod 31 is extended and the cab is tilted as shown in FIG. 2 by inspecting the engine or the like, the stopper member 37 is rotated in the direction of arrow A so that the stopper member 37 is inserted into the notch 47 of the bracket 45. , The engaging member 43 at the tip of the
If the engagement is made between the positions b, the stopper member 37 prevents the piston rod 31 from contracting and prevents the tilted cab from descending.

After the inspection, the cab is returned to its original position. After the stopper member 37 is rotated in the direction of arrow B to disengage the engagement member 43 from the bracket 45, the stopper member 37 is removed. The piston rod 31 may be contracted by being sandwiched between the two elastic pieces 41. As described above, according to the stopper device 35 according to the present embodiment, it is possible to prevent the tilted cab from being lowered, and in the present embodiment, the two brackets 39 and 45 provided on the hydraulic cylinder 25 and the two brackets Since the stopper device 35 is constituted by one stopper member 37 interposed between 39 and 45, the structure is extremely simple and the number of parts is reduced as compared with the conventional stopper device 1 shown in FIG. The weight of the device 35 itself can be reduced.

FIG. 3 shows an embodiment of the stopper device according to claims 1 and 3. In the stopper device 51 according to this embodiment, a cross section of the stopper member 53 is used instead of the stopper member 37 made of a round bar. It is formed of a substantially U-shaped steel material, and is similarly rotatably mounted on the outer periphery of the cylinder tube via brackets 39 in the directions of arrows A and B, and is attached to the fixing member at the tip of the piston rod in the direction of arrow A. A bracket 55 having a substantially U-shaped cross section into which the tip of the stopper member 53 rotated to
Fixing the stopper member 53 and the bracket 55 to the fixing pin 57
It is intended to be fixed with.

The stopper member 53 is arranged at the position shown by a two-dot chain line during normal running, and is fixed by any fixing means (not shown) provided on the outer periphery of the cylinder tube. In addition, in the drawing, reference numerals 59 and 61 denote fixing pin insertion holes provided in the stopper member 53 and the bracket 55.

Since the stopper device 51 according to the present embodiment is configured as described above, during normal traveling, the stopper member 53 is rotated in the direction of arrow B as shown by a two-dot chain line in FIG. This may be fixed by fixing means. Then, after the piston cab is extended and the cab is tilted by inspection of the engine or the like, the stopper member 53 is rotated in the direction of arrow A, and the stopper member 53 is fitted into the bracket 55.
Fixing the bracket 55 and the stopper member 53 to the fixing pin 57
, The stopper member 53 prevents the piston rod from contracting and prevents the tilted cab from descending.

After returning to the cab after the inspection,
After removing the fixing pin 57 and rotating the stopper member 53 in the direction of arrow B to fix it to the fixing means, the piston rod may be contracted. As described above, the stopper device 51 according to the present embodiment also prevents the lowered cab from lowering. Of course, in the present embodiment also, the two brackets 39 and 55 provided on the hydraulic cylinder and the two brackets 3
Since the stopper device 51 is constituted by one stopper member 53 and the fixing pin 57 interposed between the stopper members 9 and 55, the structure is extremely simple and the number of parts is reduced as compared with the conventional stopper device 1, and the cost and the stopper device are reduced. The weight of the 51 itself can be reduced.

FIG. 4 shows an embodiment of the stopper device according to claim 1 and claim 4. The stopper device 62 according to this embodiment comprises a cylinder 63 having the same shape as the bracket 45 provided on the fixing member 33. The stopper member 65 is attached to the outer periphery of the tube 27 so as to be freely detachable between the brackets 45 and 63. The stopper member 65 has circular engagement members 67 at both ends as shown in the figure.
When the cab is tilted by extending the piston rod 31, the stopper member 65 is connected to the notches 47, 69 of the brackets 45, 63.
And the engaging members 67 at both ends thereof are connected to two pieces 45a, 45b and 63a, 63 of the brackets 45, 63, respectively.
When engaged between the positions b, the stopper member 65 prevents the piston rod 31 from contracting and prevents the tilted cab from descending.

To return the cab to its original position, the stopper member 65 may be removed from the brackets 45 and 63, and the piston rod 31 may be contracted. As described above, the stopper device 62 according to the present embodiment also prevents the cab in which the stopper member 65 is tilted from lowering, and the two brackets 4 provided on the hydraulic cylinder also in the present embodiment.
5 and 63 and 1 interposed between both brackets 45 and 63
Since the stopper device 62 is constituted by the stopper member 65, the structure is extremely simple and the number of parts is reduced, as in the above embodiments, so that the intended purpose can be achieved.

In the embodiment shown in FIGS. 1 and 4, the cutouts 47, 49, and 69 are each formed in a U-shape, but it is a matter of course that the present invention is not limited to such a shape.

[0029]

As described above, according to the stopper device of the cab tilt mechanism according to each claim, the structure is extremely simple and the number of parts is reduced as compared with the prior art, so that the cost and the weight of the stopper device itself are reduced. It has become possible.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a stopper device according to an embodiment of the present invention.

FIG. 2 is an overall perspective view of the stopper device shown in FIG. 1 at the time of cab tilt.

FIG. 3 is an overall perspective view of the stopper device according to the first and third embodiments at the time of cab tilt.

FIG. 4 is an overall perspective view of the stopper device according to the first and fourth embodiments at the time of cab tilt.

FIG. 5 is a side view of a cab and a chassis frame showing a cab tilt state by a conventional hydraulic cab tilt mechanism.

FIG. 6 is an enlarged perspective view of a main part of a conventional stopper device.

FIG. 7 is a side view of a conventional stopper device.

[Explanation of symbols]

 25 Hydraulic cylinder 27 Cylinder tube 31 Piston rod 35, 51, 62 Stopper device 37, 53, 65 Stopper member 39, 45, 55, 63 Bracket 43, 67 Engagement member 57 Fixing pin

Claims (4)

[Claims] 1. A bracket is provided on the outer circumference of a cylinder tube of a hydraulic cylinder of a hydraulic cab tilt mechanism pivotally mounted between a cab and a frame and on a distal end side of a piston rod, and a stopper member is provided between the two brackets when the cab is tilted. A stopper device for a cab tilt mechanism, wherein a stopper is interposed. The stopper member is made of a round bar-shaped steel material rotatably mounted on a bracket provided on the outer periphery of the cylinder tube, and its tip can be engaged with the bracket on the piston rod side when the cab is tilted. The stopper device for a cab tilt mechanism according to claim 1, wherein: 3. The stopper member is made of a steel material having a substantially U-shaped cross section rotatably mounted on a bracket provided on the outer periphery of the cylinder tube, and its tip is attached to the bracket on the piston rod side when the cab is tilted. 2. The stopper device for a cab tilt mechanism according to claim 1, wherein the stopper device is fixed via a fixing pin. 4. The stopper member is made of a round bar-shaped steel material that is detachable from a bracket provided on an outer periphery of a cylinder tube and a distal end side of a piston rod.
The stopper device of the cab tilt mechanism described in the above.