JPS6312203Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a front three-point linkage device.

It is known that the front part of the tractor body is equipped with a three-point link so that it can be raised and lowered, and a working machine such as a snow blower, earth removal plate, mower, etc. can be connected thereto.

With this front-mounted three-point link, the work equipment can be raised and lowered in front of the tractor body, so the three-point link itself needs to be designed compactly.
In addition, although the design is compact, it must ensure smooth and reliable lifting and lowering without twisting.

In conventional examples, since the top link and the lifting cylinder interfere with each other, it is common to provide them with a position offset in the width direction of the vehicle body, which makes it difficult to achieve the above-mentioned requirements. Ta.

In view of the above points, the present invention was devised to solve this problem, and embodiments thereof will be described in detail below with reference to the drawings.

Figures 1 and 2 show a snow blower as a working machine, and a snow blower as a working machine.
Although FIG. 4 shows an example in which a soil removal plate is attached, the working machine may be a mower or the like.

In each figure, reference numeral 1 denotes a tractor body, in which an engine 2 is mounted near the front and is surrounded by a bonnet 3. Reference numeral 4 denotes a front vehicle bearing stand, which is constructed by extending a bumper 6 over the front part of a pair of left and right frames 5.
The frame 5 is fixed to the side wall of the engine, extends forward, and suspends the front wheel 7 using a center pin (not shown).

8 is a three-point link, which is provided on the front vehicle bearing stand 4. That is, a pair of left and right lower link brackets 9 are fixed to the pedestal 4, reinforced through brace stays 10, and extended downward, and the lower portions of the brackets 9 are connected to each other with a cross bar to form a front view. The tip of a support arm 13, which is fixed to the lower abdomen 11 of the vehicle body via a flange bolt connecting means 12, is fixed to the cross bar. Note that the support arm or beam 13 extends forward along the center of the lower abdomen of the vehicle body.

One end of the pair of left and right lower links 14 is pivotally connected to each lower end of the bracket 9 via a pivot pin 15 and extends forward, and a cross bar 16 is fixed in the longitudinal direction midway of each link 14 in a bridging manner. The bar 16 has a box-shaped hollow cross section and has a bracket 17 in the middle in the longitudinal direction.

Reference numeral 18 denotes a top link attachment body, which holds the bumper 6 between a base plate 19 and a clamping plate 20 and attaches the bolt 2.
1, and can be slid and fixed in the width direction of the vehicle by tightening and loosening bolts 21, and can be detached and attached.

A pair of left and right mounting plates 22 are fixed to the base plate 19 and stand upwardly. One end of a lifting cylinder 24 is removably pivoted to the upper part of the plate 22 via a pin 23. The end is removably pivoted to the bracket 17 of the cross bar 16 with a pin 25, and the liquid feeding pipe 26,
By applying hydraulic pressure via 26A, the lower link 14 can freely swing up and down using the pivot pin 15 as a fulcrum.

27 is a top link, which has a fork 28 at one end, and this fork 28 connects to the mounting plate 22.
is removably pivoted to with a pivot pin 29, and 2
The elevating cylinder 24 is inserted into the bifurcated portion 28, and both 24 and 27 intersect in an X-shape when viewed from the side, and the bifurcated portion 28 has a length and width that do not interfere with each other even when they move relative to each other. There is. In addition, Toplink 2
7 is a telescopic fixing part 30 with a screw structure, hydraulic structure, etc.
has.

When installing the snow blower 31 as shown in Fig. 1.2, the power take-off device 32 shown as a wrap transmission type and the power receiving shaft 33 of the snow blower 31 are interlocked and connected by a joint shaft 35 with a cover 34, so the top link Although the mounting body 18 is unevenly located on one side of the bumper 6, when installing the earth removal plate 36 as shown in Figs. 3 and 4, a power take-off system such as a joint shaft 35 is not required, The mounting body 18 is fixed to the bumper 6 at the center of the vehicle body width. Therefore,
The power take-off device 32 can be attached and detached by tightening and loosening bolts (not shown).

In any case, the lower link 14 is removably connected to a bracket 37 or 38 at the bottom of the work machine with a pin 39, and the top link 27 is removably connected to a bracket 40 or 41 at the top of the work machine with a pin 42. Ru. In addition, the snow blower 31 is a snow collecting auger 4.
3, a blower 44, a discharge chute 45, etc., and the direction of the chute 45 can be changed by remote control from the driver's seat using an interlocking body 46. Others, 1st
In Figure 2, 47 indicates a power transmission shaft, which is linked to the engine.

In the above configuration, the three-point link 8 can be attached to the snow blower 3 by pivotally connecting the lower link 14 to the bracket 37 or 38 via the pin 39 and the top link attachment 27 to the bracket 40 or 41 via the pin 42.
In either case, if hydraulic pressure is sent to the lifting cylinder 24 via the liquid sending pipes 26, 26A, the snow blower 31 or the earth removal device can be installed via the three-point link 8. The plate 36 can be moved up and down.

At this time, the lifting cylinder 24 is
Because it is inserted in the bifurcated part 28 of 7, both 2
4 and 27, and the lifting force of the lifting cylinder 24 is transferred to the lower link 1 via the crossbar 16.
It can be applied to the center between 4 and 14, that is, it can be applied to the left and right center of the three-point link 8, thereby ensuring smooth and reliable lifting and lowering.

In addition, in the case of a so-called drive-type working machine such as a snow blower 31 or a mower (not shown), it is possible to raise and lower the snowplow using the three-point link 8 and to transmit power using a power take-off device 32 or the like. Further, the lifting cylinder 24 may have a piston rod pivoted to the mounting body 18 and a tube pivoted to the lower link 14, contrary to the diagram, or may be a single-acting type in which lifting is done by hydraulic pressure and lowering is done by its own weight. .

In the present invention, in a three-point link 8 that is provided at the front of the vehicle body 1 so that it can be raised and lowered, a cross bar 16 is used to connect the longitudinal intermediate portion of a pair of left and right lower links 14, 14 that are pivotally connected to the vehicle body side and extend forward. The top link attachment body 18 is fixed to the vehicle body side between the lower links 14 and 14 in an upright manner, and the bifurcated portion 2 is connected to each other.
The bifurcated portion 28 of the top link 27 having a diameter of 8 is pivotally attached to the erected middle portion of the top link attachment body 18, and one end of the lifting cylinder 24 is pivotally attached 23 to the upper end portion of the top link attachment body 18. The lifting cylinder 24 is inserted into the bifurcated portion 28 so that the top link 27 and the lifting cylinder 24 intersect in an X shape in side view, and the other end of the lifting cylinder 24 is inserted in the bar length direction of the cross bar 16. The three-point link 8 is pivoted in the middle so that it can be raised and lowered by the lifting cylinder 24, and the forked part 28 has a length and width that do not interfere with each other due to relative movement between the forked part 28 and the lifting cylinder 24. Since the present invention relates to a front-mounted three-point linkage device, it has the following advantages.

The top link attachment body 18, which is installed upright on the vehicle body side, has a top link 27 at the middle of the upright position.
The bifurcated portion 28 is pivotally attached 29, and one end of the lifting cylinder 24 is pivotally attached 23 to the upright upper end portion, so the top link attachment body 18 doubles as attachment of two members. The number of parts is small and the structure is simple.

Since the bifurcated portion 28 of the top link 27 and the lifting cylinder 24 intersect in an X-shape in a side view, it can be made compact in the height direction. Since the other end of the lifting cylinder 24 is pivotally attached to the middle of the bar 16 in the length direction, the lifting force of the lifting cylinder 24 is applied to the widthwise center portion of the three-point link 8, and this is where the twisting occurs. You can move up and down easily and reliably without any bumps.

Even if the bifurcated portion 28 of the top link 27 and the lifting cylinder 24 intersect in an X-shape, the bifurcated portion 28 has a length and width that do not interfere with each other due to relative movement between the bifurcated portion 28 and the lifting cylinder 24. As a result, there is no mutual sliding contact between the forked part 28 and the lifting cylinder 24, and the lifting and lowering of the three-point link 8 is ensured.
4 is inserted, the bifurcated portion 28 serves as a lateral protector for the lifting cylinder 24, thereby further improving durability.

[Brief explanation of the drawing]

Fig. 1 is a side view of the present invention when a snow blower is attached, Fig. 2 is a plan view of the same, Fig. 3 is a side view of the present invention when a soil removal plate is attached, and Fig. 4 is a plan view of the same. . DESCRIPTION OF SYMBOLS 1... Vehicle body, 8... Three-point link, 14... Lower link, 16... Cross bar, 18... Top link attachment body, 24... Lifting cylinder, 27...
...Toplink, 28...Two forks.

Claims (1)

[Scope of utility model registration request] In a three-point link 8 which is provided at the front of the vehicle body 1 so as to be freely raised and lowered, the longitudinal intermediate portions of a pair of left and right lower links 14, 14 which are pivotally connected to the vehicle body and extend forward are connected to each other by a cross bar 16. , the top link attachment body 18 is fixed in an upright manner on the vehicle body side between the lower links 14, 14, and the forked portion 28 of the top link 27 having the forked portion 28 is fixed to the upright intermediate portion of the top link attachment body 18. At the same time, one end of the lifting cylinder 24 is pivotally connected 23 to the upper end portion of the top link mounting body 18, and the lifting cylinder 24 is inserted into the bifurcated portion 28 to connect the top link 27 and the lifting cylinder 24. intersect in an X-shape in side view, and the other end of the lifting cylinder 24 is pivotally connected to the middle of the cross bar 16 in the bar length direction.
5, the three-point link 8 can be raised and lowered by the lifting cylinder 24, and the bifurcated portion 28 and the lifting cylinder 2
The length and width that do not interfere with each other in relative motion with 4 are 2
A front-mounted three-point linkage device, characterized in that the furrow portion 28 has one.