JPH0139267Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is suitable for vertically retractable work vehicles, etc., in which the front body and the rear body are connected by a rotation pin so that they can rotate in a vertical plane. This invention relates to a refraction device for a vertical refraction type work vehicle that can be applied to.

(b) Conventional technology Work vehicles like this have existed for a long time.

For example, Utility Model Application No. 57-171978, Utility Model Application No. 58-
As seen in No. 157732 and Utility Model No. 178068, etc., the front body is equipped with the engine, transmission, steering wheel, and other power-generating control parts, and the rear body is used for various types of work vehicles (generally (mostly dump beds), and the two were connected.

By the way, as mentioned above, this type of work vehicle handles the load and vehicle weight by bending the front and rear bodies in a vertical plane (up and down) using the pivot pin as a bending point. It buffered the unevenness of the road surface.

(c) Problems that the invention aims to solve However, in this type of work vehicle, the vertical refraction angle increases depending on the amount of cargo loaded, so if this exceeds a certain limit, the refraction angle will increase. may become abnormally large and may cause damage to the member.

Therefore, there is a need for a suitable mechanism to prevent this, but so far no mechanism has been found that is inexpensive and functions reliably.

This invention solves this problem and provides a refracting device that meets these requirements.

(d) Means to solve the problem Therefore, this idea takes the following measures.

That is, the front and rear bodies can be rotated in a vertical plane by pivoting connecting members extending from the front and rear bodies toward the other using horizontal rotation pins. In the vertical bending type work vehicle, an end structure is provided on each of the two connecting members, and a rod equipped with a spring that springs the two connecting members in a direction away from each other is installed between the end structures. The basic configuration of the structure is that one of the end structures is installed so that it can be moved forward and backward, and can be rotated in a vertical plane. An additional feature is that a switch is provided with a certain clearance on the extension of the tip of the rod on the one end structure side.

(e) Effect: As a result, a rod is provided between the connecting members on both sides of this rotation pin, which is resilient in a direction that separates the connecting members from each other (bending the front and rear vehicle bodies vertically when viewed from the side). At the same time, since the end structure that supports the ends of these rods is configured to be able to rotate in the vertical plane, even if such rods exist, the rotation in the vertical plane of the front and rear car bodies can be prevented. There is no obstruction. Not only that, but since these rods are pushed in a direction that separates the connecting members from each other, even if the weight builds up on the rear body (the same goes for the front body), it can counteract this. . Furthermore, the more weight is applied to the rear vehicle body, the more this rod moves, making it possible to detect the specified amount of displacement with a switch or the like and prevent overloading.

(f) Example Hereinafter, a case where an example of this invention is applied to a work vehicle whose front body and rear body can bend (rotate) even in a horizontal plane will be explained with reference to the drawings.
The figure is a side view of the vertically retractable work vehicle when the rear body is used as a dump loading platform, Figure 2 is a plan view, Figure 3 is a partial cross-sectional view showing details around the traveling work axis, and Figure 4
5 and 5 are a partially sectional side view and a plan view showing a specific example of the rod and its end structure.

The vertical bending type work vehicle consists of a front vehicle body 1 and a rear vehicle body 2, and connecting members 3 and 4 of the frame body are extended from both 1 and 2 toward the other, respectively, and these end portions are vertically extended. Along with polymerizing,
A connecting pin 5 is inserted into this portion for connection. Therefore, both the front vehicle body 1 and the rear vehicle body 2 are rotatable in the horizontal plane around the connecting pin 5, thereby enabling steering operation.

The front body 1 is equipped with a steering wheel 6, a seat 7, an engine 8, etc.
The handle 6 is connected to an arm 10 mounted on the rear vehicle body 2 side from a steering mechanism 9 that is operated by the handle 6.
It is connected by a connecting rod 11 to. As a result, when the handle 6 is turned, each of the above-mentioned members is activated, and the front vehicle body 1 and the rear vehicle body 2 can be bent (steering) around the connecting pin 5.

The power of the engine 8 is transmitted to a transmission case 13 which is freely rotatably supported by a support shaft 12 in the longitudinal direction, and further,
The power is then transmitted to the axle 15 of the front wheels 14 of the front vehicle body 1. In addition, since a differential device is housed and installed in the differential gear case 16 (hereinafter referred to as differential case 16) at the center of this axle 15, steering is performed by this method. .

Next, on the rear body 2 side, although this differs slightly depending on the type, the rear wheel 17, differential case 1
8. The axle 19 etc. are permanently installed, and in addition to this, for example, if the work vehicle specification is
(see figure), the loading platform 20 is supported by a support pin 22 between it and the frame 21, and a hydraulic cylinder 23 for raising and lowering the loading platform 20 is connected to the loading platform 20.
and the frame 21.

Further, in the above, the power of the engine 8 is transmitted from the differential case 16 of the front vehicle body 1 to the differential case 18 of the rear vehicle body 2 by the traveling drive shafts 24 and 25 extending from the differential cases 16 and 18, respectively. Since the vehicle body 1 and the rear vehicle body 2 are designed to be able to rotate in a horizontal plane around the connecting pin 5 (although they can also rotate in a vertical plane as described later), the respective differential cases 16 and 18 In addition to providing universal joints 26 and 27 at the entrances of the drive shafts 24 and 25 so that they can be bent freely, the connecting parts of the drive shafts 24 and 25 are also fitted with splines to expand and contract. It is also necessary to keep it at your disposal (see Figure 3).

By the way, this invention is based on the vertical bending type working vehicle configured as described above, by providing another rotation pin 28 in the left and right direction near the connecting pin 5.
The front vehicle body 1 and rear vehicle body 2 are configured to be able to rotate even within a vertical plane.

Next, a rod 30 is provided on the upper side of the connecting members 3 and 4 so that the both connecting members 3 and 4 are urged away from each other by a spring 29, and both ends of the rod 30 are are supported by end structures 31 and 32, and these end structures 31 and 32 are installed on both sides of the connecting pin 5 and the rotation pin 28, and both of them are supported in both the horizontal plane and the vertical plane. It is constructed so that it can be rotated even inside the body.

That is, as the end structure 32 on the side of the rear vehicle body 2, a pin 33 is made to stand up from the connecting member 4, and a cylindrical body 35 having a wall portion 34 having a space in the vertical direction formed in the front thereof is rotatably inserted into the pin 33. Alternatively, one end (rear end) of the rod 30 described above may be inserted into the wall portion 34 and the pin 36 may be inserted from the side. Furthermore, as the end structure 31 on the side of the front vehicle body 1, a pin part 37 is rotatably inserted in the vertical direction of the connecting member 3, and a support that slidably supports one end (front end) of the rod 30 above the pin part 37 is provided. A receiver 39 having a portion 38 is provided, and the receiver 38
When viewed in cross-section, it is conceivable to have a curved shape with the diameter increasing toward the outside (see FIGS. 4 and 5).

This allows both end structures 31 and 32 to rotate both in the horizontal plane and in the vertical plane, and the rod 30 also expands and contracts accordingly.

By the way, with the above configuration, the heavier the weight on the rear vehicle body 2 side, the more the rod 30 contracts against the spring 29 (left row in FIG. 4). If the switch 40 is provided with a certain clearance L on the extension line from the tip of the switch 40, it is possible to detect excessive load on the rear vehicle body 2.

(g) Effects of the invention First, by providing the rotating pin 28 near the connecting pin 5, the structure is simple and inexpensive.
Both the connecting members 3 and 4, that is, the front vehicle body 1 and the rear vehicle body 2, can rotate both in the horizontal plane and in the vertical plane, resulting in excellent steering and running performance.

In addition, the rod 30 is connected to the connecting pin 5 and the rotating pin 2.
8 is supported by the respective end structures 31 and 32 on the upper side of both the connecting members 3 and 4, and these end structures 31 and 32 are supported in either the horizontal or vertical plane. Since it is possible to rotate the connecting members 3 and 4 vertically and horizontally,
Does not inhibit rotation.

Further, since the rod 30 is elastically biased by the spring 29 so as to make both the connecting members 3 and 4 into a chevron shape when viewed from the side, the rod 30 not only acts as a resistor against loading onto the rear vehicle body 2, but also acts as a resistor during driving. This absorbs the shock from the ground and provides a comfortable ride. Note that if the front end of the rod 30 is formed with a step, when the rear vehicle body 2 is overloaded, this step will come into contact with the end surface of the receiving portion 38 and prevent further bending, a so-called stopper action. You can also expect

In addition, if the switch 40 described above is provided, it is possible to detect a case where a load exceeding a specified amount is placed on the rear vehicle body 2, so that an alarm can be sounded or the engine 8 can be stopped. Appropriate measures can be taken to ensure an appropriate loading capacity and to prevent damage to suspension parts.

[Brief explanation of drawings]

The drawings show an embodiment of this invention,
Fig. 1 is a side view of a vertically folding work vehicle when the rear body is used as a dump loading platform, Fig. 2 is a plan view of the same, and Fig. 3 is a partial sectional view showing details around the traveling work axis.
FIGS. 4 and 5 are a partially sectional side view and a plan view showing a specific example of the rod and its end structure. Code, 1... Front vehicle body, 2... Rear vehicle body, 3... Connecting member, 4... Connecting member, 28... Rotating pin, 2
9... Spring, 30... Rod, 31... End structure, 32... End structure, 40... Switch,
L...Clearance.

Claims (1)

[Claims for Utility Model Registration] The front vehicle body 1 and the rear vehicle body 2 are connected by pivotally connecting connecting members 3 and 4 extending toward each other from the front vehicle body 1 and the rear vehicle body 2 using horizontal rotation pins 28. In a vertically folding working vehicle in which the rear vehicle body 2 is configured to be able to rotate within a vertical plane, end structures 31 and 32 are provided on both the connecting members 3 and 4, respectively, and a gap between the end structures 31 and 32 is provided. A rod 30 equipped with a spring 29 that springs the connecting members 3 and 4 in a direction away from each other is movable back and forth with respect to the both end structures 31 and 32, and with respect to one of the end structures 31. A bending device for a work vehicle of a vertical bending type, characterized in that each bending device is installed so as to be rotatable within a vertical plane. A utility model according to claim 1, characterized in that a switch 40 is provided at a certain clearance L on the extension of the tip of the rod 30 on one end structure 31 side which is constructed so as to be movable back and forth. Refraction device for vertical refraction type work vehicles.