JPS5920448Y2 - Side shake prevention device for single-arm skid steer shovel loader - Google Patents

Description

[Detailed description of the invention] This invention relates to a shovel and rad steer type shovel loader that drives the left and right wheels independently for running and steering. The present invention relates to an arm lateral vibration prevention device in a single-arm skid steer shovel loader.

Conventional skid steer shovel loaders are generally of the double-arm type, with arms for raising and lowering the vehicle on both sides of the vehicle body, so getting in and out of the driver's seat is done from the front side of the vehicle body. Since there are pedals and levers for driving and cargo handling, as well as packets, etc. on the front side of the vehicle body, getting on and off from the front side is never easy.

In view of this, a single-arm type shovel loader has been proposed in which the arm is provided only on one side of the vehicle body so that getting in and out of the driver's seat is done from the other side. The lateral vibration of the arm is a problem compared to the double-sided arm type, and this lateral vibration occurs especially when scooping with a packet that is subject to a large load, and the stability of the packet is impaired. .

The present invention was developed in view of the problems found in the one-side arm type mentioned above.The present invention has been developed by attaching a lateral vibration restraining member to the front side of the vehicle body, and placing this lateral vibration restraining member near the lower end of the arm with respect to the arm. An object of the present invention is to provide a lateral vibration prevention device for a single-arm skid steer shovel loader, which is capable of preventing lateral vibration of the arm and stabilizing the packet during scooping by engaging the two arms at the same time. .

Hereinafter, illustrated embodiments embodying the present invention will be described in detail.

As shown in the figure, in the single-arm skid steer shovel loader of this embodiment (hereinafter simply referred to as the shovel loader), the arm 5 for raising and lowering the packet 14 is arranged on the right side of the vehicle body, and the driver's seat can be entered and exited from the left side of the vehicle body. is configured to take place.

A rear boss 3 is horizontally suspended between the upper ends of both pillars 2, 2' which are erected and fixed at the rear ends of the side frames 1, 1' of the vehicle body, and a rear boss 3 is rotatably inserted through the rear boss 3 and is rotatably inserted into the right end of a shaft 4. The rear end of arm 5 is fixed.

The arm 5 extending in the front-rear direction is formed in a substantially curved shape, and is rotated up and down by a lift cylinder 6 with the rear shaft 4 as a fulcrum.

A counter arm 7 is pivotally connected to the bent portion of the arm 5 by a pin 8, and the front end of a connecting rod 9 whose rear end is pivotally connected to the counter arm 7 by a pillar 2 pin 8a is connected to the pin 10. At the same time, a dump cylinder 11 for dumping the packet 14 is pivotally mounted at a pin 12.

Further, one end of a bracket shaft 13 extending horizontally in the lateral direction is fixed to the front end of the arm 5, and a packet bracket 15 having a packet 14 on the front side of the bracket shaft 13 as shown in FIG. boss part 1
6 are rotatably fitted together, and the piston rod 11a of the dump cylinder 11 is connected to the packet bracket 15 by a pin 17, so that the packet 14 is moved to the bracket shaft 1 by expansion and contraction of the dump cylinder 11.
Damped around 3rd round.

On the front right side of the front plate 18 fixed to the front ends of the side frames 1, 1', there is a lateral vibration restraining member 19 for preventing the arm 5 from lateral vibration when the arm 5 is in the lowered position. is installed.

This lateral vibration restraining member 19 is constructed from two retaining plates 20 facing each other with an interval corresponding to the arm width, and a stopper plate 21 fixed approximately in the center between both retaining plates 20. The lower end portion of the bracket 22 is pivoted to the flange 22a of a substantially U-shaped bracket 22 fixed to the lower right side of the front square plate 18 by means of a pin 23 so as to be swingable in the front-rear direction.

The lateral vibration restraint member 19 is always urged forward by a compression spring 24 interposed between the front plate 18 and the back surface of the stopper plate 21, and its swing range is limited to the web 22b of the bracket 22. It is regulated by a plate 25 fixed to the front end of the flange 22a.

That is, the lateral vibration restraining member 19 has an engaging portion surrounded by a retaining plate 20 and a stopper plate 21,
By engaging with the lowered arm 5, this retaining portion restrains the arm 5 from swinging laterally, and over a certain range of motion from the lowered end of the arm 5, it follows the movement of the arm 5 and swings. The state of engagement with the moving arm 5 is maintained.

On the other hand, on the lower left side of the front surface of the front plate 18, the packet bracket 1 is provided when the arm 5 is located at the lower end.
An arm stopper 26 is protruded and fixed to receive the load during scooping by contacting the left end of the boss portion 16 of the arm 5, and the front end surface of the arm stopper 26 is within a certain range of motion from the lower end of the arm 5. The anim 15 is formed into an obliquely curved surface corresponding to the locus of motion of the anim 15 so as to maintain a state of contact with the boss portion 16 over the entire length.

Further, in this embodiment, a fuel tank 27 is formed on one (left side) pillar 2', increasing the storage capacity and reinforcing the vehicle body.

Furthermore, in order to make the features of the single arm type more effective,
As shown in FIGS. 1 and 2, when steering is in the form of a steering wheel, a steering wheel 2 is provided in front of the seat 28
9, as well as a travel pedal 30 and a cargo handling operation lever 3.
1, instruments 32, etc. are arranged closer to the side where the arm 5 is present, and when the steering is one-bar type as shown in FIG. 7, the steering lever 33 is similarly arranged closer to the right side. This makes it easier to get on and off the driver's seat.

Note that 34 is a step board provided on the side frame 1' for getting on and off.

As described above, in this embodiment, the arm 5 for lifting and lowering the packet is arranged on one side of the vehicle body so that the driver can get on and off from the other side, and the arm 5 of the lateral shake restraining member 19 is attached to the front of the vehicle body. A stopper 26 is provided, so that the packet 1
When the arm 5 is located at the lower end, such as during scooping work by 4 or during normal running, the arm 5 engages with the engaging portion of the lateral vibration restraining member 19 to prevent the arm from lateral vibration. At the same time, the boss portion 16 of the packet bracket 15 comes into contact with the arm stopper 26, so that the pushing force acting on the packet 14 is received, and the packet 1
4 is held steady.

Then, when the arm 5 is at the lower end, the lateral vibration restraining member 19 that engages with the arm 5 is pushed backward by the arm 5 against the compression spring 24, as shown in FIG. It is in the end position, but when arm 5 rises, the fifth
As shown by the imaginary line in the figure, the arm 5 is swung forward following the movement and maintained in a fixed state over a certain range of motion of the arm 5.
On the other hand, like the lateral vibration restraining member 19, the arm stopper 26 also maintains a state of contact with the boss portion 16 of the packet bracket 15 over a certain period of movement of the arm 5, so that the stable state of the packet 14 due to the stopper effect is maintained by the arm 5. It is secured not only at the lower end of the line but also within a certain range.

Next, another embodiment of the present invention will be described.

In the embodiment shown in FIG. 8, the arm stopper 26 is
The arm stopper 26 is configured to move back and forth in accordance with the movement of the packet bracket 15, and is brought into contact with the boss portion 16 of the packet bracket 15 over a certain range of motion. It is fitted into the guide 35 so as to be movable back and forth.

On the other hand, at the rear of the vehicle body, a roller 37 that comes into contact with a cam 36 provided on the rear shaft 4, which is the rotational fulcrum of the Animu 5
An operating rod 38 having an upper end thereof passes through a guide cylinder 39 attached to the side surface of the pillar 2 so as to be able to move up and down, and the lower end of the operating rod 38 is connected to the arm via a bell crank 40 and an interlocking rod 41. The roller 37 is connected to the stopper 26 and is tensioned between the tip of the bell crank 40 and a part of the guide cylinder 39.
is urged in a direction to bring it into contact with the cam 36.

Therefore, within a certain range of motion from the lower end of the arm 5, the operating rod 38 moves up and down in response to the rotation of the cam 36.
The arm stopper 26 moves back and forth via the arrow , and continues to be in contact with the boss portion 16 of the packet bracket 15 .

Further, in another embodiment shown in FIG. 9, the rolling restraint member 19 is changed from the swinging type in the previous embodiment to a sliding type.

That is, the lateral vibration restraining member 19 is constructed from a square stepped rod having a U-shaped engagement portion 19a that can be secured to the arm 5 at its tip, and is also connected to a square tube 42 fixed to the front plate 18. The arm 5 is slidably supported via a compression spring 43, and can follow the movement of the arm 5 and maintain a state of engagement with the arm 5 over a certain range.

Although not shown, it is also possible to use a weight instead of the compression spring 24 as a means for biasing the rocking type lateral vibration restraining member 19 forward.

As described in detail above, the present invention provides a single-arm skid steer excavator loader in which a lateral vibration restraining member is provided on the front of the vehicle body that can be secured to the arm, and is configured to follow the movement of the arm near the lowering end of the arm. This prevents the arm from swinging sideways by maintaining the state of alignment with the arm over a certain range.This provides a reinforcing effect against lateral swing, especially when scooping where a large amount of lateral swing occurs. It is possible to maintain a stable state of the packet during work, and is effective in preventing wobbling during normal driving.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a side view of a single-arm skid steer shovel loader, Fig. 2 is a plan view of the same, and Fig. 3 shows a vehicle body structure equipped with a lateral vibration prevention device and a cargo handling device. FIG. 4 is a perspective view showing the lateral shake prevention device, FIG. 5 is a side view similarly showing the operating state, and FIG.
The figure is a perspective view showing a packet and a packet bracket; FIG. 7 is a plan view of a vehicle with one steering wheel and a one-way steering system;
FIG. 8 is a side view showing another embodiment of the arm stopper, and FIG. 9 is a plan sectional view showing another embodiment of the lateral vibration restraining member. 5...Arm, 14...Packet, 1
8... Front plate, 19... Lateral vibration restraining member, 20... Engagement plate, 21...
Stopper plate, 24... Compression spring, 26.
...Arm stopper.

Claims (1)

[Scope of utility model registration request] In a single-arm skid steer shovel loader that has an arm on either side of the vehicle body that supports the packet,
A lateral vibration restraining member having an engaging portion that can be engaged with the arm is mounted on the front side of the vehicle body opposite to the arm so as to be movable back and forth, and the lateral vibration restraining member extends from the lower end of the arm. A lateral shake prevention device characterized in that it is biased to move back and forth following the arm while maintaining an engaged state with the arm over a certain range of motion.