JP3173622B2 - Powered wheel up and down adjustment device for walking type mobile agricultural machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0101]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for adjusting the up and down wheels of a walking type mobile agricultural machine (for example, a binder). More specifically, the present invention relates to a powered wheel up / down adjustment device.

[0092]

2. Description of the Related Art Japanese Patent Laid-Open Publication No. Sho 61-189840 entitled "Wheel Vertical Adjustment Device" discloses a power type wheel vertical adjustment device of this type.
Is known. In this known technique, the wheel case is made to be able to swing up and down around the axis of the horizontal axis, and the effective length of the vertical wheel up and down axis (the distance between the wheel case and the body frame) on the running wheel side of the wheel case is adjusted to the wheel up and down. There is disclosed a configuration in which the rotation of the shaft is freely changeable, and the vertical movement of the wheel is rotated by the power from a wheel case, whereby the vertical adjustment of the wheel is performed by a power type.

[0093]

In the above-mentioned prior art, the up and down adjustment of the wheels is facilitated by making the up and down adjustment of the wheels powered, but the operation for changing the up and down position of the running wheels is performed. There is a problem that the load is concentrated on the screw portion of the single wheel vertical shaft and the operation load is large, and the wheel vertical adjustment operation cannot be performed simultaneously with various operations.

[0093]

According to the present invention, a connecting link comprising an upper link and a lower link pivotally connected to each other is provided between an upper portion of the wheel case near the axle and the body frame, and the power from the transmission case is provided. And a driving piece inserted into the horizontal screw shaft is interlocked with a forward / backward moving shaft pivotally attached to a pivot point between the upper link and the lower link in the connection link via a horizontal L bracket. Then, the connection link is extended and contracted in the vertical direction by the rotation of the horizontal screw shaft, thereby constituting a wheel up-down adjustment device.

[0056]

When adjusting the vertical position of the wheel, the horizontal screw shaft is driven to rotate by the power from the transmission case, and the connecting link is extended and contracted in the vertical direction via the driving piece, the horizontal L bracket, and the longitudinal movement shaft.

[0086]

EXAMPLES Hereinafter, based on examples showing the case where the present invention is applied to a binder, referring to FIG. 1 and FIG.
The present invention will be described in detail. A binder in which a cutting section is provided at a front end of the body frame 14 and a transmission case 13 is provided at a rear end of the body frame 14 supports the wheels 12 of the traveling wheels 11 and transmits driving force to the traveling wheels 11. The wheel case 10 is pivotally supported by a horizontal axis 20 below the transmission case 13 so that the traveling wheel 11 can swing up and down, and the wheel up and down adjusting device 1 is mounted between the body frame 14 and the wheel case 10. Equipment is the same as that of a known binder wheel up / down adjustment device. In FIG. 1, reference numeral 16 denotes a handlebar, and 17 denotes an engine.

The wheel lifting and lowering device 1 of the present invention is provided with a connecting link 2 between the upper part 10a of the wheel case 10 on the wheel side and the body frame 14 so that the wheel side of the wheel case 10 can be expanded and contracted. To change the vertical position of the wheels, and to move back and forth by the power from the intermediate pivot point of the connecting link 2 and the transmission case. The connection link 2 has a lower end portion of an upper link 2A whose upper end portion is pivotally connected to the body frame 14 via a mounting plate 21, and an upper end portion of a lower end link 2B whose lower end portion is pivotally connected to an upper portion of a wheel shaft of the wheel case 10. Are pivotally connected to each other by a pivot 2C, and the pivot 2C is used as a pivot point.
The effective length of the connecting link 2 in the vertical direction is changed by the parallel movement of C. In order to drive the parallel movement of the pivot point (the pivot 2C) by the power from the transmission case 13, the front-rear movement shaft 3 whose front end is pivotally connected to the pivot point (the pivot 2C), and the middle part thereof is a vertical axis. A horizontal L-shaped bracket 5 pivotally supported by 5a and having an upright end 5b pivotally attached to a rear end of the longitudinal movement shaft 3 via a ball joint 4, and pivotally attached to the other end of the horizontal L-bracket 5. Arm 6, a horizontal screw shaft 7 provided on a transmission case 13,
A drive piece 8 which is inserted into the horizontal screw shaft 7 and is screwed with the screw portion 7a of the horizontal screw shaft 7 to be integrated with the arm 6;
It is configured to convert the rotation of the horizontal screw shaft 7 into the horizontal movement of the longitudinal movement shaft 3.

The lateral screw shaft 7 and the lateral shaft (third shaft) 20 of the transmission case are transmitted via the pawl clutch 9, and at the upper and lower limits of the connecting link 2, the pawl is inclined by the pawl slope of the pawl clutch 9. When the sliding escapes, the rotation drive of the horizontal screw shaft 7 is stopped. The vertical operation of the wheels can be changed by controlling the rotation and stop of the horizontal screw shaft 7 irrespective of the work (the rotation of the traveling output shaft and the work drive shaft) by the clutch operation by the pawl clutch 9. Regarding the mechanism of forward rotation, reverse rotation, and stop of the horizontal screw shaft 7 by the above-described clutch operation, a combination of a well-known forward / reverse switchable gear transmission mechanism and a pawl clutch sliding mechanism provides a technology that was obvious at the time of filing the present application. Can be achieved by applying. For example, a spline shaft is formed on a part of the lateral screw shaft 7, and a pawl clutch is inserted into the spline shaft so that the pawl clutch can be freely moved in the spline axis direction. The forward gear is inserted into the spline shaft in a loose state, and the pawl clutch is engaged with the forward transmission gear as the forward transmission gear side, thereby “forward rotation”.
The reverse rotation transmission gear can be configured to select “reverse rotation” by engaging with the reverse rotation transmission gear, and “stop” by setting the neutral position between the forward rotation transmission gear and the reverse rotation transmission gear. can do. When adjusting the vertical position of the wheels, the horizontal screw shaft 7 is rotationally driven by the power from the transmission case 13, and the horizontal movement of the driving piece 8, the horizontal L bracket 5, the front-rear movement shaft 3, and the like causes the connection link to pivot. The effective length of the connecting link 2 changes from La to Lb by moving the fulcrum (the pivot 2C) back and forth, thereby changing the inclination angle of the link 2A and the link 2B and expanding and contracting the connecting link 2 in the vertical direction. The position is adjusted (see FIG. 3). In the embodiment, the traveling wheels are arranged on both sides of the wheel case 10 in a two-wheel system. However, it is needless to say that the present invention can be applied to a one-wheel system.

[0099]

According to the present invention, the rotation of the horizontal screw shaft is linked to the vertical expansion and contraction of the connecting link via the horizontal movement of the horizontal L bracket and the longitudinal movement shaft, so that the horizontal screw is driven by the power from the transmission case. Since the vertical position of the wheel is changed by rotating the shaft to expand and contract the connecting link in the vertical direction, the vertical position adjustment of the wheel can be easily operated by women and girls as a power type, and a well-known power type In comparison, by moving the pivot point (axis 2C) of the connecting link back and forth,
The load for the vertical position adjustment operation of the wheel is small, and the vertical position adjustment operation can be performed while performing various operations.

[Brief description of the drawings]

FIG. 1 is a side view of a wheel up / down adjusting device according to an embodiment in which the present invention is applied to a binder.

FIG. 2 is a plan view of the same.

FIG. 3 is a schematic diagram illustrating a wheel up / down adjustment operation of the present invention;
Fig. a is a plan view, and Fig. b is a side view.

[Explanation of symbols]

1. Wheel up / down adjustment device 2. Linkage link
3: Forward / backward movement axis 5: Horizontal L bracket 7 ... Side screw axis 1
0: Wheel case 11: Running wheel case

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60K 17/30 A01D 37/00

Claims (1)

(57) [Claims] A wheel case for supporting an axle of traveling wheels and transmitting driving force to the traveling wheels is pivotally supported below a transmission case so that the traveling wheels can freely swing up and down. A walk-type mobile agricultural machine equipped with a wheel up-and-down adjusting device between the upper and lower links provided on the axle side of the wheel case and the body frame; A horizontal screw shaft driven by power from a case is provided, and is linked with a forward / backward moving shaft pivotally attached to a pivot point between the upper link and the lower link in the connection link, and a driving piece and an intermediate portion inserted into the horizontal screw shaft The horizontal screw shaft is interlocked with the longitudinal movement axis via a horizontal L bracket pivotally supported by a vertical axis, and the rotation of the horizontal screw shaft causes the connecting link to expand and contract in the vertical direction, thereby providing a wheel. Powered wheel vertical adjusting device and changes the vertical position.