JPH0316783Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is based on an agricultural vehicle equipped with a steering device of an Atsukerman link mechanism having a steering yoke, in which the steering yoke is formed into two parts, and each part is divided into two parts. The present invention relates to a lock/unlock mechanism in a steering device which is mechanically locked and unlocked.

[Conventional technology]

For agricultural vehicles, the turning radius should be made as small as possible when driving at low speeds such as when working in the field, and when driving at high speeds such as during transportation work, the vehicle should be equipped with a steering mechanism that provides a driving feel and steering performance similar to that of regular automobiles. It is desirable to be present. For this reason, in four-wheeled self-propelled vehicles, in order to reduce the turning radius compared to the amount of steering wheel operation, methods have been adopted such as reducing the steering speed reduction ratio or steering all four wheels.

[The problem that the idea aims to solve]

However, in the former case, in the current steering mechanism, there is an upper limit to the operational performance of the steering wheel reduction ratio. In addition, the latter had problems in terms of driving sensation and steering performance, such as the need to switch between the steering system when driving at low speeds and when driving at high speeds.

[Means to solve the problem]

Therefore, in the latter case, the present invention provides a steering system equipped with an Atsukerman-type steering link mechanism having a steering yoke, in which the steering yoke is coaxially divided into upper and lower halves, and one of the yokes is connected to a wheel. The yoke is connected to the side steering arm, and the yoke and the body frame are locked and unlocked using a locking metal fitting.The yoke that is divided into two parts is connected and uncoupled using a metal fitting that is linked to this operation, and the yoke is locked and unlocked to the car body frame. A link system is constructed by connecting a rod for inputting a steering force to a yoke other than the yoke to be released, and is configured to lock or unlock the Atsukerman steering link mechanism. It is something.

[Effect]

With the above configuration, the yokes can be connected and uncoupled at the same time by locking and unlocking the steering yoke, thereby providing good operability and preventing erroneous operations.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

In Figures 1 to 3, the code 1 is the front 2.
A frame for an agricultural vehicle that has two rear wheels.
are protruding and formed. The upper part of a shaft 3 is fixed to the bracket 2 and projects downward, and a first yoke 4 is pivotally supported on the shaft 3 so as to be freely rotatable in the horizontal direction. This first yoke 4 is
It spreads forward and backward around a narrow shaft support, and its front end edge and rear end edge are each formed in an arc shape, and its front end protrudes to the front side of the frame 1 to form a front notch 4a at the center of the front end edge. Further, the rear end projects rearward from the shaft 3 and forms a rear notch 4b at the center of the rear edge. One end of a pair of rods 5 is rotatably supported on the first yoke 4 on both the left and right sides of the rear notch 4b.
The other end is pivotally connected to the tips of operating arms 8, 8 for rear wheels 7, 7, which are steerably provided at both ends of a wheel support rod 6 attached to the vehicle body.

A second yoke 9 is coaxially supported below the first yoke 4, which is supported by the shaft 2. This second yoke 9 has an L-shape, and its bent portion is pivoted, and the bent end is connected to the frame 1.
and the other side extends parallel to the first yoke 4, and a notch 9a corresponding to the rear notch 4b is formed on the rear end edge extending parallel to the first yoke 4. has been done.

A pair of left and right support pieces 1 are provided in front of the frame 1.
0 protrudes, a first meshing metal fitting 11 is pivotally supported between the support pieces 10 by a pin 12 so as to be rotatable back and forth, and an operating wire 13 is connected to the upper end of the first meshing metal fitting 11. At the same time, the engaging metal fittings 11
The yoke rotates around the pin 12 so that its lower end engages with the front notch 4a of the first yoke and locks it, or disengages and releases the lock. Further, a base end portion of a release wire 14 is attached below the pivot position of the pin 12 of the first meshing fitting 11, and the other end portion is connected to a pair of left and right wires protruding from the first yoke 4. The support piece 15 is connected to a second engagement fitting 17 whose upper end is supported by a pin 16 . A coil spring 18 is interposed between the outer part of the release wire 14 and the second engagement fitting 17, and urges the second engagement fitting 17 in the direction of the arrow in FIG. It is designed to engage and lock, and to release the engagement and release the lock. The rear end of a rod 19 is pivotally supported at the end of a portion of the second yoke 9 that is substantially parallel to the frame 1, and the tip thereof extends toward the front wheel.
It is connected to a handle gear box (not shown). Further, the operating wire 13 is connected to an operating lever and a hydraulic cylinder (not shown) provided near the driver's seat of the vehicle body.

In the above configuration, when the state shown in FIG. Since the rod 19 is locked, even if you move the rod 19 back and forth in FIG.
The yoke 9 only rotates around the shaft 3, and the movement of the rod 19 is not transmitted to the rod 5. Therefore, the rear wheels 7, 7 are not steered. At this time, the first
If the front notch 4a of the yoke 4 is positioned so that the wheels match the direction in which the vehicle is traveling straight,
Regardless of how the handle is operated to drive the rod 19, the wheels are oriented in the straight direction.

Next, when the vehicle is traveling straight, when the operating wire 13 in FIG. Notch 4a of yoke 4 of
At the same time, the second engaging metal fitting 17 engages with the rear notch 4b of the first yoke 4 and the notch 9a of the second yoke 9 via the release wire 14. Tell the rear wheel 7
to steer.

Note that in the above embodiment, the operating wire 13
The coil spring 18 may be a rod, and the coil spring 18 may be wound around the pin 16 or may be a leaf spring. The rod 19 may also be connected to a hydraulic cylinder in a power steering system. Furthermore, an electromagnetic clutch, an air cylinder, a hydraulic cylinder, etc. are connected to the tip of the operating wire 13, and a speed detector is attached to the axle or the like to detect the running speed of the vehicle. By performing on/off control or expansion/contraction control such as the above, it is possible to automatically lock/unlock the steering system depending on the traveling speed of the vehicle.

The mechanism with the above configuration can be applied to a vehicle that is steered by a combination of an articulate steering mechanism and an Atsukerman link steering mechanism, or a vehicle that uses an Atsukerman link steering mechanism for both the front and rear axles. You can demonstrate your characteristics by FIG. 4 shows an example in which an articulation type steering mechanism and an Atsukerman link type operating mechanism are incorporated into the rear axle to improve steering performance during low speed running. Further, FIG. 5 shows a case in which the steering mechanism of the rear wheels 7 is locked in the same vehicle as in FIG. 4, emphasizing the driving sensation during high-speed running. In the case of FIG. 4, a turning radius much smaller than that in FIG. 5 can be obtained with the same amount of steering wheel operation as in the case of FIG.

Figure 6 shows an example of coordinated steering in which the Atsukerman link type steering mechanism is used for the front and rear axles.By adopting the above embodiment for the front and rear axle steering mechanisms, the vehicle body Steering method suitable for the work machine to which it is attached (front wheel steering,
(rear wheel steering or coordinated steering) can be selected, allowing effective use of the vehicle itself. For example, when using a mower to reap forage crops, a front-loading mower makes it possible to cut into extremely narrow areas, and a reciprocating mower uses rear-wheel steering for front-loading, front-wheel steering for rear-loading, and front-wheel steering for rear-loading mowers. In case of installation, you can select the coordinating steering wheel and perform the appropriate work. In addition, when a reciprocating mower is mounted on the belly, if it is mounted in the center of the front and back of the vehicle body, the center of rotation by the coordinated steering will be on the extension of the center line of the front axle and rear axle, allowing smooth mowing without causing loss of mowing. Work becomes possible.

Figure 7 shows an example of club steering in which the Atsukerman link type steering mechanism is adopted for the front axle and the rear axle.As in the case of coordinated steering, the above embodiment can be adopted for the steering mechanism for the axle and rear axle. Accordingly, it is possible to select a steering method (front wheel steering, rear wheel steering, or club steering) suitable for the work equipment attached to the vehicle body or the work content. For example, when cutting grass on a sloping grass field, skidding of the vehicle is always a problem when working on the sloping grass field (especially work in the direction of contour lines), and club steering can be considered as a steering method to solve this problem. However, it is extremely difficult to turn using club steering alone, and smooth work on slopes is nearly impossible. In such situations, if the mechanism of the above embodiment is incorporated into the vehicle device, club steering can be selected for work in the contour line direction, and front wheel steering or rear wheel steering can be selected when turning. Grassland work becomes possible. In addition, the vehicle incorporating the mechanism of the above embodiment can be effectively used for work in fields where slopes and flat areas are mixed in one grass area, or in fields that have both slopes and flat areas.

[Effect of idea]

As explained above, according to the locking/unlocking mechanism in the steering system of the present invention, the Atkermann type steering linkage mechanism having the steering yoke can be simultaneously connected and unlocked by locking/unlocking the steering yoke. Since the connection can be released, operability is improved and erroneous operations are prevented. In addition, the steering mechanism can be selected as appropriate depending on the usage pattern of the vehicle, driving sensation, and operability.
It is possible to improve turning performance and work performance.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an Atsukerman link type operating mechanism showing an embodiment of the present invention, Fig. 2 is an enlarged plan view of the main parts, Fig. 3 is a sectional view taken along the - line in Fig. 2, 4 to 7 are explanatory views of the operation of a vehicle to which the present invention is applied. 1...Frame, 2...Bracket, 3...
Shaft, 4...first yoke, 4a...front notch,
4b... Rear notch, 5... Rod, 6... Wheel support rod, 7... Rear wheel, 8... Wheel steering arm, 9
...Second yoke, 9a...Notch, 10, 15
...Support piece, 11...First meshing fitting, 12,
16...Pin, 13...Operation wire, 14...Release wire, 17...Second meshing fitting, 18
... Coil spring, 19 ... Rod.

Claims (1)

[Scope of Claim for Utility Model Registration] In a steering device equipped with an Atsukerman-type steering link mechanism having a steering yoke, the steering yoke is coaxially divided into upper and lower halves, and one of the yokes is used to steer the wheel side. The yoke is connected to the arm, and the yoke and the vehicle body frame are locked and unlocked using a locking metal fitting, and the two-divided yoke is connected and uncoupled using a metal fitting that is linked to this operation, and the yoke is locked and unlocked to the vehicle body frame. A steering system characterized in that a link system is constructed by connecting a rod for inputting a steering force to a yoke other than the yoke, and is configured to lock or unlock the Atskerman type steering link mechanism. Lock/unlock mechanism.