JPH0156021B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a so-called articulated steering type work vehicle, and particularly to a connection structure between a front vehicle body and a rear vehicle body.

Conventional technology Construction work vehicles such as shovel loaders and dump trucks have a front frame of the front body,
There is one in which the rear frame of the rear vehicle body is connected with an intermediate connecting member. The steering mechanism of this type of work vehicle has the following structure. That is,
For example, a steering handle is provided on the rear vehicle body side, and by operating the steering handle, the rear vehicle body is rotated horizontally with respect to the front vehicle body using the connecting portion as a fulcrum, thereby changing the direction of travel. It is something. Such a mechanism is called an articulate mechanism. By adopting this articulation mechanism, there is an advantage that the direction can be reliably changed with a small turning radius compared to a type of vehicle that changes the direction of travel by changing only the direction of the wheels through steering operation.

In this type of articulate steering type work vehicle, the articulate steering system is used to prevent the front and rear bodies from colliding with each other and damage when changing direction, and to prevent damage to the steering cylinder. It is necessary to provide a mechanism to limit functionality to a certain extent.

Problems to be Solved by the Invention Conventionally, articulation was limited by, for example, providing a stopper projecting rearward from the front frame on the front vehicle body side and bringing it into direct contact with the rear frame of the rear vehicle body. was.
In this case, in a so-called oscillation type vehicle in which the front body and the rear body are oscillated around the axis in the longitudinal direction of the body using the front connecting member as a swinging fulcrum, articulation is limited; That is, if the stopper oscillates while in contact with the rear frame or the like, there is a problem in that the front and rear frames rub against each other and the abutting portions are worn out.

Purpose of the Invention The present invention provides that, in a work vehicle equipped with both the articulate function and the oscillate function, even when the articulate mechanism is operating to the set limit, the front and rear body To provide a structure capable of oscillating without the vehicle bodies coming into contact with each other and rubbing against each other.

Means for Solving the Problems The present invention has been made to achieve such an object, and the front vehicle body 2 and the rear vehicle body 3 are connected via a connecting member (for example, an oscillating pin 17). , in a working vehicle that is connected to be horizontally rotatable and swingable about the longitudinal axis of the vehicle body, the connecting member (oscillating pin 17) is connected to one of the front and rear vehicle bodies 2 and 3. A first stopper (for example, oscillating pin 17) that limits the articulation by coming into contact with the articulation stopper 25 provided on the side, for example, the front vehicle body 2 side.
The protrusion 21) provided at the front end and the other side, i.e.
Oscillating stopper 2 provided on the rear body 3 side
8 to limit the oscillation (for example, the flange 22 of the oscillating pin 17
It is characterized by being provided with a receiving part 23 that has a portion that projects laterally.

For example, when the rear body 3 rotates horizontally with respect to the front body 2 together with the connecting member (oscillating pin 17) and the articulation mechanism is operating, the connecting member (oscillating pin 17) )
A first stopper (for example, a protrusion 21 projecting forward) provided in the front vehicle body 2 contacts an articulation stopper 25 provided on the front vehicle body 2 side to limit articulation. Even in that case, the rear vehicle body 3 is connected to the connecting member (the oscillating pin 1
7) can be freely oscillated.

On the other hand, the rear body 3 rotates around the longitudinal axis of the front body 2 using the connecting member (oscillating pin 17) as a swing fulcrum, and the second stopper ( For example, even if the supporting part 23) provided to protrude laterally comes into contact with the oscillation stopper 28 provided on the rear vehicle body 3 side and the oscillation is restricted, the rear vehicle body 3 It can freely rotate horizontally relative to the vehicle body 2. Due to these, the front and rear vehicle bodies 2 and 3 do not interfere with each other.

Embodiment FIG. 2 illustrates a shovel loader 1 as a so-called articulated steering type work vehicle. In the figure, 2 and 3 are connection mechanisms 4
The front body and the rear body of the shovel loader 1 are shown connected through the body. On the upper side of the front vehicle body 2, a working machine section 6 including a bucket 5 and others is provided. 7 is a front wheel also provided at the lower part of the front vehicle body 2. On the other hand, rear body 3
An operator seat 8 is provided above the operator seat 8, and a steering handle 9 and various operating levers 10, 10 are arranged around the operator seat 8. 11 is a rear wheel also provided at the lower part of the rear vehicle body 3. Reference numeral 12 denotes an engine mounted on the rear side of the rear vehicle body 3, and is configured to transmit driving force to the wheels 7 via a drive shaft 13 that is extended between the front and rear vehicle bodies 2 and 3. Further, driving force is transmitted to the rear wheels 11 via a transmission device 13'.

Therefore, the front frame 14 of the front vehicle body 2
On the rear end side, as shown in FIG. 3, an articulate pin 16 constituting the coupling mechanism 4 is vertically passed between the upper and lower frame plates 15, 15. To,
An oscillating pin 17 serving as a connecting member arranged in the front-rear direction is attached so as to be freely rotatable in the horizontal direction. As shown in FIG. 4, this oscillating pin 17 has a connecting portion 19 that opens in a vertically cylindrical shape at the front end side of a horizontally arranged cylindrical pin body 18. The articulate pin 16 is inserted into the shaft hole 20 at the center of the shaft hole 20 . Further, at the front end of the oscillating pin 17, a protrusion 21 serving as a first stopper of the present invention is provided on the outer periphery of the lower end of the connecting portion 19.
is formed. On the other hand, a portion of the flange 22 between the pin body 18 and the connecting portion 19 projects laterally, and its rear edge serves as a receiving portion 23 as a second stopper. As shown in FIG. 1, the rear end portion of a piston rod 24 is connected to the flange 22 portion on the front end side of this receiving portion 23. As shown in FIG. Although not shown, the front end side of the piston rod 24 is connected to a hydraulic cylinder device fixed to an appropriate location on the front frame 14, and the piston rod 24 moves forward and backward by the operation of the hydraulic cylinder device. For example, when the piston rod 24 extends in the direction of the arrow in FIG.
rotates in the direction of the arrow in the figure using the articulate pin 16 as a fulcrum.

Reference numerals 25 and 25 shown in FIG. is fixed. Therefore, when the oscillating pin 17 rotates to the set limit, the protrusion 21 engages with the articulate stopper 2.
The articulation is limited by contacting either one of 5 and 25.

On the other hand, the pin body 1 on the rear side of the oscillating pin 17
A cylindrical member 27 integral with the rear frame 26 of the rear vehicle body 3 is rotatably fitted on the pin body 8, and the rear frame 26 is pivoted about the pin body 18.
is designed to oscillate in the vertical direction.
That is, the rear frame 26 horizontally rotates with respect to the front frame 14 using the articulation pin 16 as a fulcrum, and the protrusion 21 of the oscillation pin 17 contacts the articulation stopper 25 to limit the articulation. Even in this state, the rear frame 26 can freely rotate around the pin body 18 on the opposite side of the protrusion 21 without contacting the front frame 14, and the articulate function is not affected. Regardless of
This allows the oscillation function to be fully utilized.

Further, on one side of the rear frame 26, a fifth
As shown in the figure, a pair of upper and lower oscillating stoppers 28, 28 are provided to protrude forward of the rear frame 26, and their tips 29, 29 are connected to the above-mentioned retaining portions formed on the oscillating pin 17. 23
They are placed with appropriate gaps between the top and bottom. When the rear frame 26 oscillates to the set limit relative to the front frame 14, the retaining portion 23 comes into contact with one of the oscillation stoppers 28, 28 to limit the oscillation.

In this embodiment, the articulation pin 16 is fixed in the vertical direction on the vehicle body 2 side,
An oscillating pin 17 is attached to this articulating pin 16 as a connecting member so that it can rotate horizontally, and a pin body 18 on the rear end side of this oscillating pin 17 connects the rear vehicle body 3 to the longitudinal axis of the front vehicle body 2. Although they are designed to be able to swing around the center, it is of course possible to attach them with them reversed front to back. In this case, in this embodiment, the articulation stopper 25 provided on the front vehicle body 2 side
A device corresponding to the oscillator stopper 28 is arranged on the rear vehicle body 3 side, while a device corresponding to the oscillating stopper 28 disposed on the rear vehicle body 3 side is conversely arranged on the front vehicle body 2 side. In other words, it should be understood that these names are merely names based on relative functions. Furthermore, the shape of the connecting member itself is
Of course, it should be noted that the present invention is not limited to the oscillating pin 17 of this embodiment.

Further, the left and right rear wheels 11 of the shovel loader 1,
Left and right rear fenders 30,3 covering 11
0, as shown in FIG. 6, one side thereof is pivotally attached to both side walls 31, 31 of the main body of the rear vehicle body 3, so that it can be opened and closed in the vertical direction. For example, taking the rear fender 30 on the left side of the figure as an example, it has the following structure. That is, one set of link pieces 32a, 32b connects to the intermediate joint portion 3.
3, and the end of one link piece 32a is pivoted to the outside of the rear fender 30, and the end of the other link piece 32b is similarly connected to the side wall 31 of the main body of the rear vehicle body 3. It is pivoted. These link pieces 32a, 32b are normally housed in a space covered by the rear fender 30 with the joint portion 33 bent downward as shown in the figure. On the other hand, the rear fender 30
As shown in FIG. 7, a handle 34 is fixed to the upper surface near the operator seat 8 in the vicinity of the operator seat 8. As shown in FIG. By pulling up this handle 34, the rear fender 30
moves up and down using the pivot portion 35 between it and the side wall portion 31 as a fulcrum, and is held as shown by the two-dot chain line in the figure. At that time, the one set of link pieces 32
a, 32b in a straight line, open the rear fender 30 to its maximum extent, bend the joint part 33 in the opposite direction, and open the rear fender 3 again.
0 is lowered, and the other link piece 32a is supported and held by the support member 36 attached to one link piece 32b. Right rear fender 30
has a similar structure. In this way, handle 3
4 to rear fender 30 operator seat 8
By placing it on the side, operator seat 8
It is possible to open the rear fender 30 while the operator 37 is on board, which has the advantage of making it easy to visually observe the rear of the rear wheel 11, as indicated by the dotted arrow 38 in FIG.

Effects of the Invention In a work vehicle in which a front body and a rear body are connected via a connecting member so as to be rotatable in the horizontal direction and swingable about an axis in the longitudinal direction of the vehicle body, the connecting member includes the following: , a first stopper that comes into contact with an articulation stopper provided on one side of the front and rear vehicle bodies to limit articulation, and a first stopper that comes into contact with an oscillation stopper provided on the other side. Since it is characterized by having a second stopper that limits the oscillation,
An articulating stopper provided on one side, for example, the front body side (e.g., front frame), and an oscillating stopper provided on the other side, ie, the rear body side (e.g., rear frame), are in direct contact. For example, even if the articulation is done to the set limit and the first stopper contacts the take-your-rate stopper and the articulation rate is restricted, the rear frame will be free regardless of this. It has come to have remarkable effects, such as being able to oscillate.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of essential parts showing one embodiment of the present invention;
Fig. 2 is an overall front view of a shovel loader as an example of a work vehicle, Fig. 3 is a vertical cross-sectional view centered on the connecting part, Fig. 4 is an overall perspective view of the oscillating pin, and Fig. 5 is the A-- 6 is a side view of the shovel loader seen from the rear, and FIG. 7 is an enlarged front view of the rear side. 2... Front vehicle body, 3... Rear vehicle body, 4... Connecting member,
16... Articulate pin, 17... Oscillate pin, 21... Projection, 23... Reception part, 25... Articulate stopper, 28... Oscillate stopper.

Claims (1)

[Scope of Claims] 1. A work vehicle in which a front body and a rear body are connected via a connecting member so as to be rotatable in the horizontal direction and swingable about an axis in the longitudinal direction of the body, comprising: The connecting member includes a first stopper that comes into contact with the articulation stopper provided on one side of the front and rear vehicle bodies to limit the articulation, and an oscillating stopper provided on the other side. A front/rear vehicle body connection structure for a work vehicle, comprising a second stopper that comes into contact with and limits oscillation.