JPH0114087Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a work equipment support device for a tractor, and more particularly to fixing a lift arm to a lift shaft.

Conventionally, the lift arm has been fixed to the lift shaft with a spline, a key, or the like, and therefore the mounting angle cannot be easily changed during work. Therefore, when supporting a working machine with a three-point link, when a difference in height is required between the left and right lower links, such as when plowing, it is not possible to set them quickly, and it is difficult to set the lower links from the ground. The lifting height setting also could not be adjusted quickly.

Therefore, the present invention supports an adjustment engagement member slidably only on the lift shaft, further forms an engagement portion having a large number of teeth on the outer periphery of the adjustment engagement member, and also forms a hole in the boss of the lift arm. A working machine which eliminates the above-mentioned drawbacks by forming an engaging part having a large number of teeth over a predetermined portion of the adjustment engaging member, and by removably fitting the engaging part of the adjustment engaging member into a hole in the lift arm. The purpose is to provide a support device.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the tractor 1 has a body 3 supported by wheels 2, and the body 3 has a lift case 5 at the rear upper part thereof, which has a built-in hydraulic device such as a hydraulic cylinder. There is. Further, a lift shaft 6 is rotatably supported on the lift case 5 so as to protrude left and right, and the lift shaft 6 is connected to a hydraulic cylinder, and an adjustment coupling device according to the present invention is installed outside the case 5. It is connected to the left and right lift arms 9 via 7. In addition, left and right lower links 10 are pivotally supported at the rear lower part of the fuselage 3, and these lower links 10 are connected via a lift arm 9 and a lift rod 11.
Three-point linkage device 1 with top link not shown
2.

As shown in FIGS. 2 and 3, the adjustment coupling device 7 has an adjustment engagement member 13, and the engagement member 13 has a cylindrical shape with a step 14, and a small diameter portion thereof. has an inner spline 15 formed on its inner diameter, and an outer spline 16 formed on its outer periphery, and its large diameter constitutes a pickup section 18, and a spring 17 is formed on its inner diameter. A large-diameter hole 19 is formed in which it can be accommodated. On the other hand, a spline 6a of a predetermined length is formed on the protruding portion of the lift shaft 6 from the case 5, and the inner spline 15 of the engagement member 13 is slidably inserted into the spline 6a. A C pin 20 is engaged with the tip thereof, and a spring 17 is compressed between the C pin 20 and the end of the large diameter hole 19 to bias the engaging member 13 toward the case 5 . The boss 9a of the lift arm 9 is rotatably supported by the case 5 and is prevented from coming off by engaging a screw 22 in an annular groove 21 formed in the case 5. An inner spline 23a is formed in the hole 23 in the portion protruding from the case 5 over approximately half the length on the case 5 side.
3a can be engaged with the outer spline 16 of the engagement member 13.

Since this embodiment has the above-described configuration, normally the adjustment engagement member 13 is operated as shown in FIG.
is biased by a spring 17 so that its outer spline 16 is engaged with the inner spline 23a of the lift arm boss 9a. In this state, the rotation of the lift shaft 6 based on the hydraulic cylinder is transmitted to the engagement member 13 by the engagement of the splines 6a and 15, and further transmitted to the lift arm boss 9a by the engagement of the splines 16 and 23a. 9
Rotate to control the lifting and lowering of the work equipment. To change the rotation angle of the lift arm 9, as shown in FIG.
Pull the engagement member 13 against the spline 1
6 and 23a are disengaged. At this time, since the movement of the engaging member 13 is restricted by the C pin 20, the outer spline 16 is inserted into the hole 23 of the boss 9a.
It never goes away. And in this state,
The lift arm boss 9a can freely rotate relative to the engagement member 13, so if the desired angle of the lift arm 9 is set and the engagement member 13 is moved in accordance with the spring 17 in this state, the lift arm boss 9a can be rotated freely with respect to the engagement member 13. Both splines 1
6 and 23a are engaged, and the lift arm 9 is set at a new angle.

In the above embodiment, the angles of both lift arms 9 can be adjusted, but in some cases, only one lift arm can be adjusted.
The other may be fixed in the same manner as before, and the engagement between the lift arm boss 9a and the adjustment engagement member 13 is not limited to splines, but may also be serrations, etc. In short, if it is done by an engagement part having a large number of teeth. good.

As explained above, according to the present invention, the adjustment engagement member 13 is slidably supported on the lift shafts 6, 6a, and the engagement portion 16 has a large number of teeth on the outer periphery of the adjustment engagement member. An engaging portion 23a having a large number of teeth is formed over a predetermined portion of the hole 23 of the lift arm boss 9a, and the engaging portion 16 of the adjustment engaging member 13 is engaged with and disengaged from the hole 23 of the lift arm 9. Since it is constructed so that it can be inserted freely, the angle of the lift arm 9 can be changed and adjusted easily, quickly and freely. Therefore, when plowing, the left and right lower links 1
0 can be quickly adjusted to an appropriate position, and the lifting height of the lower link 10 can also be quickly adjusted. Furthermore, lift arm 9
The angle can be adjusted by pulling the adjustment engagement member 13, and even in the stretched state, the engagement portion 16 of the engagement member 13 is inserted into the hole 23 of the lift arm 9. The radial positions of the lift shaft 6, the engaging member 13, and the lift arm boss 9a do not shift, and can always be adjusted reliably.

[Brief explanation of drawings]

Fig. 1 is a schematic side view showing a tractor to which the present invention is applied, Fig. 2 is a sectional view showing the connected state of the adjustment coupling device according to the present invention, and Fig. 3 is a sectional view showing the adjusted state. . DESCRIPTION OF SYMBOLS 1... Tractor, 6... Lift shaft, 6a... Spline, 7... Adjustment connection device, 9... Lift arm, 9a... Boss, 13... Adjustment engagement member, 1
6...An engaging part (spline) having a large number of teeth,
23... Hole, 23a... Engaging portion (spline) having a large number of teeth.

Claims (1)

[Scope of utility model registration request] In a work machine support device in which a lift arm is connected to a lift shaft, an adjustment engagement member is slidably supported on the lift shaft, and an engagement portion having a large number of teeth is provided on the outer periphery of the adjustment engagement member. An engaging portion having a large number of teeth is formed over a predetermined portion of the hole of the boss in the lift arm, and the engaging portion of the adjustment engaging member is removably inserted into the hole of the lift arm. Work equipment support device.