JPH0139266Y2 - - Google Patents

Description

[Detailed Description of the Invention] Object of the Invention The present invention relates to a so-called articulated steering type work vehicle, and more particularly to a locking device for locking a horizontal articulation mechanism.

BACKGROUND OF THE INVENTION Some work vehicles such as dump trucks and wheel loaders have a main body separated into a front body and a rear body, and the front and rear bodies are connected at a joint. The steering system for this type of work vehicle has the following structure. That is, for example, a steering handle is provided on the front vehicle body, and by operating the steering handle, the rear vehicle body is rotated horizontally with respect to the front vehicle body using the joint portion as a fulcrum, and the direction of travel is changed. This is what I did. Such a mechanism is called an articulate mechanism.

Adopting this articulation mechanism has the advantage of being able to reliably change direction with a small turning radius, compared to a system that changes the direction of travel by changing only the direction of the wheels through normal steering operations. . However, when servicing the joint or transporting the joint on a trailer, it is necessary to lock the articulation mechanism. This type of locking device is generally one in which a front frame and a rear frame are directly connected by a safety bar or the like.

However, in the so-called oscillating type vehicle in which the front and rear vehicle bodies swing vertically centering on the longitudinal direction, a hydraulic cylinder device to operate the articulation mechanism and an oscillating lock to lock the above-mentioned swinging are required. It is necessary to install the device on the front frame or rear frame,
It is structurally difficult to directly connect these frames with a safety bar or the like without interfering with these devices.

Furthermore, the conventional method of connecting safety bars requires one person to sit in the driver's seat and slightly move the steering wheel while the other person inserts a pin into the safety bar, which is time-consuming. There were flaws.

Purpose of the invention The purpose of the invention is to provide a novel articulation lock device that can be operated by one person and has a simple structure.

Structure of the invention The present invention makes the front and rear car bodies mutually rotatable in the left and right direction and swingable up and down via articulation pins in the vertical direction and oscillation pins in the longitudinal direction of the car body. In the connected work vehicles, a protrusion that rotates in the left-right direction integrally with the one vehicle body projects around the articulate pin, and the protrusion contacts the left and right sides of the protrusion to rotate the vehicle body in the left-right direction. A pair of stoppers is provided on the other vehicle body side to restrict the rotation range of the stopper to a certain angle or less, and the projection is fitted into the space between the projection and each stopper with the projection located in the middle between the two stoppers. A locking member for locking this protrusion at that position is provided on either side of the vehicle body so as to be able to be inserted into and removed from the space, and an operating member provided at an appropriate position on the vehicle body is connected to the locking member via a spring. They are characterized by being interlocked and connected to each other.

Embodiment FIG. 1 shows a side view of the entire dump truck 1 as a work vehicle equipped with an articulated steering mechanism.

That is, the front vehicle body 2a and the rear vehicle body 2b are connected by a joint portion 3 at the center of the vehicle body.
The front body 2a is provided with a steering handle 4, a front wheel 5, a seat 6, a safety guard 7, etc., and the rear body 2b is provided with:
A vessel 8, a hydraulic cylinder 9 for raising and lowering the vessel 8, a rear wheel 10, and the like are provided. 11
is a drive shaft for transmitting driving force from an engine (not shown) provided in the front vehicle body 2a to the rear wheels 10. However, the front body 2a
At the rear end of the side front frame 12, as shown in FIGS. 2 to 5, a vertical articulation pin 13 that constitutes the joint portion 3 is provided. Cylindrical joint part 1 at the front end of the oscillating pin 14 in the front-rear direction
4a is attached so as to be freely rotatable in the horizontal direction. A rear frame 15 on the rear vehicle body 2b side is attached to the main body of the oscillating pin 14 so as to be swingable in the vertical direction.

Reference numeral 16 in FIG. 2 denotes a hydraulic cylinder device fixed to the front frame 12, and the cylinder body 17a is installed inside the front frame 12, and the tip of the piston rod 17b is connected to the flange 18 of the oscillating pin 14. It is pivoted at one end. An oscillating lock device 20 is provided at the other end of the flange 18 to lock the swinging motion. 19 is a hydraulic pipe that supplies hydraulic oil to the hydraulic cylinder device 16. When changing the direction of travel, the hydraulic cylinder device 16 is actuated by operating the steering handle 4, and the rear frame 15 is moved, for example, as shown by the two-dot chain line in the figure.
It is rotated by rotating around the articulate pin 13. As described above, the outside of the oscillating pin 14 and the front frame 12 has a fairly complicated structure, and if the flange 18 is extended outward to provide a mounting portion for a connecting member such as a safety bar, the art. In order to secure space for the oscillator, the front frame 12 must be cut out by that amount, which reduces the structural strength. It is not possible to provide a mounting portion for the member.

21 in Figures 3 and 4 is the oscillator pin 1
4. This is a protrusion provided on the outer periphery of the lower end of the front end. 2
Reference numerals 2 and 22 designate articulate stoppers provided around the articulate pin 13, and are fixed to the lower plate 12a of the front frame 12 so as to sandwich the protrusion 21 therebetween. This articulate stopper 22,
In order to prevent the vessel 8 from colliding with the safety guard 7 when turning, the numeral 22 contacts the protrusion 21 and limits the range of rotation of the rear frame 15 around the articulation pin 13. This is essential for regulating the angle below.

23 is an articulation lock device according to the present invention. The structure of this articulation lock device 23 will be explained in detail below.

24 and 25 are a pair of left and right mounting plates attached to the lower plate 12a. Reference numeral 26 denotes a horizontal rod that is rotatably supported through the mounting plates 24 and 25, and its base end protrudes outward from the front frame 12. 27 is this horizontal rod 26
This is a lock member consisting of a cylindrical boss 28 that is rotatably fitted on the outside, and a lock plate 29 that is integrated with the cylindrical boss 28. The tip of the lock plate 29 is located between the articulating stoppers 22, 22 and the protrusion 21 of the oscillating pin 14 when the protrusion 21 is located between the two stoppers 22, 22. The protrusion 21 is formed in a bifurcated shape so that it fits into the space formed, that is, the articulating space, and the protrusion 21 is locked in that position. Reference numeral 30 denotes a torsion spring fitted around the horizontal rod 26, one end of which is fixed to the horizontal rod 26, and the other end fixed to the lock plate 29. Reference numeral 31 denotes an indicator rod attached to the outer periphery of the cylindrical boss 28, which projects downward from the front frame 12 when the lock is released. 32 is an operating lever attached to the base end of the horizontal rod 26 projecting outward from the front frame 12 as described above;
This is a locking device for the operating lever 32 attached to an appropriate location on two sides. 34 is the operation lever 3
2 and the upper plate 12b of the front frame 12
This is a coil spring interposed between the

Operation explanation (a)...When articulating lock The operation lever 3 is located at the position indicated by the two-dot chain line in Fig. 5.
2 to the position indicated by the solid line, and engages with one notch 35a of the locking tool 33 to turn it "on." Then, the horizontal rod 26 rotates counterclockwise in conjunction with the operating lever 32, and the torsion spring 30
The lock plate 29 is rotated through the . At this time, if the tip of the lock plate 29 does not match the space formed by the articulating stops 22, 22 and the protrusion 21, it will not be able to fit into that space, and the lock plate 29 will not fit into the space. , while being pressed downward by the torsion spring 30, it is held in a state where it is always in contact with somewhere between the articulation stoppers 22, 22 and the protrusion 21. In such a case, operate the steering handle 4 to release the oscillating pin 14.
Rotate around the articulate pin 13. Then, the protrusion 21 of the oscillating pin 14
When the lock plate 29 is rotated to a position corresponding to the space, the lock plate 29 is pushed by the torsion spring 30 and fitted into the lock plate 29 to be locked. With the operating lever 32 turned on in this way,
The lock is applied semi-automatically by just slightly moving the steering handle 4, and even one person can easily operate it. At this time, the display bar 31 is hidden behind the front frame 12 and becomes invisible. In this way, it can be easily determined whether the lock has been applied from the outside.

(b) When releasing the articulation lock, rotate the operating lever 32 from the solid line position in FIG. Engage with the notch 35b,
Turn it off. Then, the horizontal rod 26 rotates clockwise and the lock plate 29 is pulled upward by the torsion spring 30. Then, in this state, the steering handle 4 is moved slightly to rotate the oscillating pin 14 around the articulating pin 13. Then,
When the lock plate 29 no longer engages with the articulating stops 22, 22 and the protrusion 21, it is pulled by the torsion spring to release the lock. At this time, the display bar 31 appears below the front frame 12.

In the above embodiment, the lock member is attached to the front vehicle body 12 side, but it is also possible to attach it to the rear vehicle body side. In addition, the locking member 29 has a protrusion 21, that is, the rear body side.
It is only necessary to configure it so that it fits into the space between the protrusion 21 and each stopper 22, 22 when it is in an intermediate position where it is not swinging with respect to the front vehicle body 12 side. Therefore, it is not necessary to attach it so that it can be rotated up and down as in this embodiment, but it may be attached so that it can be slid up and down or back and forth, for example. In this case, the spring 30 for operating the locking member 29 may be of a tension type or a pressure type in addition to a torsion type.

Effects In the present invention, a single locking member that can be freely fitted and removed into the space between the conventionally provided articulating stopper and the protrusion of the oscillating pin, that is, the articulating space, is provided. Since the locking member and the operating member are simply connected to each other via a spring, the structure is compact and the number of parts is small. Furthermore, by connecting the locking member and the operating member with an elastic member, for example, the operating member can be When you return to the driver's seat and move the steering wheel slightly, the locking member is moved by the elastic member and the lock is engaged semi-automatically. It is now possible for one person to easily operate the device by just going back and forth a few times.

[Brief explanation of the drawing]

Figure 1 is a side view of an articulate steering type dump truck, Figure 2 is a plan view showing the frame structure, and Figure 3 is an exploded perspective view of the articulate pin and oscillate pin that make up the joint. , FIG. 4 is a partial sectional view showing the articulation lock device of the present invention, and FIG.
This figure is also an explanatory diagram of the operation seen from the X direction of FIG. 4. 2a...front vehicle body, 2b...rear vehicle body, 3...
joint part, 13... articulate pin, 14... oscillator pin, 21... projection part,
22... Articulate Stoppa, 27...
Lock member, 29...Lock plate, 30...
Torsion spring, 32...operation lever.

Claims (1)

[Scope of utility model registration request] In a work vehicle in which a front body and a rear body are connected to each other via an articulation pin in the vertical direction and an oscillation pin in the longitudinal direction of the vehicle body so as to be mutually rotatable in the left-right direction and swingable up and down,
A protrusion that rotates in the left-right direction integrally with the one vehicle body is protruded around the articulate pin, and the protrusion abuts on both left and right sides of the protrusion to limit the range of rotation in the left-right direction of the vehicle body. A pair of stoppers are provided on the other vehicle body side to restrict the angle to below, and with this protrusion located in the middle between the two stoppers, the protrusion is fitted into the space between the stopper and each stopper. A locking member that locks at a certain position is provided on either side of the vehicle body so as to be able to be inserted into and removed from that space, and the operating member provided at an appropriate position on the vehicle body and this locking member are interlocked and connected to each other via a spring. An articulation lock device for a work vehicle, characterized by: