JPH0739366Y2 - Lower link runout control device for tractor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lower link shake restricting device for a tractor for restricting shake of a lower link in a three-point link mechanism of a tractor or the like.

(Prior Art) Conventionally, a method of mounting a check chain has been adopted as a structure for restricting the deflection of the lower link of a tractor. For example, as shown in FIG. 5, the front ends of the lower links 103 are pivotally connected to the lower rear sides of the transmission case 101, which constitutes the tractor vehicle body, via mounting pins 102, and are connected to the left and right rear axle cases 104. The check chain brackets 105 attached to the respective check chains 106 and the check chains 106 were attached to the lower links in the front-rear direction.

107 is a top link, 108 is a hydraulic device for lifting the working machine, 109
Is a lift arm, 110 is a lift arm 109 and lower link 10
3 It is a lift rod that connects the middle part.

And the rear end of each lower link 103 is connected to the working machine,
The horizontal deflection of the lower link 103 during the work was restricted by the left and right check chains 106 being in a tension shape.

(Problems to be solved by the invention) However, with the regulation of the runout by the check chain 106, it is difficult to obtain a strong check force, a runout of about 100 mm occurs, and work that does not like horizontal runout, for example, blade work However, there was a drawback that good work could not be performed.

In view of the above problems, an object of the present invention is to provide a lower link shake restricting device for a tractor, which improves the shake restricting effect.

(Means for Solving the Problem) The technical means is to provide the tractor vehicle body 4 with the rear lower part both sides,
The front ends of the left and right lower links 1 are pivotally connected,
In the lower link shake restricting device of the tractor, in which the shake restricting members 13 are respectively mounted between the connecting part 11 on the rear axle case side and the connecting part 7 in the front-rear midway part of the lower link 1,
The shake restricting member 13 is made of an elongated plate material, a long hole 26 elongated in the front-rear direction is formed in the rear end connecting part 25 of the shake restricting member 13, and the inner surface of the lower link 1 side connecting part 7 and the rear end connecting part 25 are formed.
A U-shaped holding bracket 27 is fitted over the outer side surface and penetrates the inner / outer holding walls 28, 29 of the holding bracket 27, the lower link 1 side connecting portion 7 and the elongated hole 26 of the rear end connecting portion 25. They are connected to each other by connecting pins 32.

(Operation) According to the present invention, since the shake restricting member 13 is made of a plate material,
It does not slacken or stretch like a check chain, its length and shape are maintained, and it can exert both strong pulling force and projecting tension, providing a strong restraining force and lower link 1 Tightly regulate the swing of.

Further, since the U-shaped holding bracket 27 is fitted over the both side surfaces of the connecting portion between the lower link 1 and the shake restricting member 13, the strength of the connecting portion is also improved.

(Embodiment) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 denotes a lower link, which is provided with ball joints 2 and 3 at a front end portion and a rear crawl portion. The front-end side ball joint 2 is pivotally supported by a tractor vehicle body 4, that is, a mounting pin 5 provided on both sides of a rear lower portion of the transmission case so as to project outwardly so as to be vertically movable. The rear end side ball joint 3 is connected to the connecting portion of the working machine.

An insertion hole 6 for connecting the lift rod is formed on the front side of the lower link 1 in the front-rear direction, and an insertion hole 7 for connecting the check chain is formed on the rear side. There is. It should be noted that strip-shaped reinforcing plates 8 and 9 are fixed to the connecting portion formed of the communication holes 6 and 7 by welding or the like.

Reference numeral 10 is a check chain bracket, which is bolted to the lower surface side of the rear axle case, and has a flat plate-like connecting portion 11 provided with an insertion hole 12 concentric with the mounting pin 5.

Reference numeral 13 is a shake restricting member, which is formed by appropriately bending an elongated plate material, and the front end connecting portion 14 is formed into a bifurcated shape, and is pivotally connected by a bolt 15 with the connecting portion 11 of the check chain bracket 10 being sandwiched. ing. In addition, a plurality of spacers 18, 18 are provided to prevent the bolt 15 and the insertion holes 16, 17 of the front end connecting portion 14 from directly sliding.
19,20,21 are intervening. 22 is a spring washer,
23 is a fastening nut and 24 is a lock nut.

On the other hand, the rear end connecting portion 25 is formed with an elongated hole 26 that is elongated in the front-rear direction, and extends in a U shape across the inner surface of the insertion hole 7 on the lower link 1 side and the outer surface of the rear end connecting portion 25. The holding bracket 27 of the holding bracket 27 is fitted from above, the insertion holes 30 and 31 of the inner and outer holding walls 28 and 29 of the holding bracket 27, the insertion hole 7 of the lower link 1,
Also, they are connected to each other by a connecting pin 32 penetrating the elongated hole 26 of the rear end connecting portion 25. The width of each of the sandwiching walls 28, 29 is formed to be longer than the length of the elongated hole 26 in the front-rear direction, so that the soil and the clogging of the elongated hole 26 are prevented.

Further, the shake restricting member 13 is formed with a recess 33 in the longitudinal direction and is reinforced by the rib effect.

34 and 35 are beta pins for retaining.

The first embodiment of the present invention is configured as described above, and since the deflection restricting member 13 is made of an elongated plate material, a stronger check force is obtained as compared with the check chain, and it is connected to the long hole 26. The relative movement of the pin 32 regulates the shake to a range of about 30 mm, and good work is possible even with blade work and the like. Further, since the connecting portion with the connecting pin 32 is formed in the long hole 26, manufacturing errors can be absorbed and the mounting becomes easy.
Furthermore, the existing connection part of the check chain can be used as it is, and it can be provided at a low cost. Further, the U-shaped holding bracket 27 can reinforce the connecting portion between the lower link 1 and the shake restricting member 13, and the durability can be improved.

FIG. 3 and FIG. 4 show the second embodiment, in which a large elongated hole 37 is formed in the rear end connecting portion 25, and a collar body 38 fitted in the elongated hole 37 so as to be reversible in the front-rear direction. The collar body 38 is provided with the elongated hole 26 which is eccentric in one of the front and rear directions. According to this configuration, by appropriately reversing and using the color body 38, it is possible to further increase the manufacturing error absorption range.

(Effect of the Invention) According to the present invention, in the lower link shake restricting device of the tractor, the shake restricting member is made of an elongated plate material, and the rear end connecting portion of the shake restricting member is formed with a long hole in the front-rear direction. A U-shaped holding bracket is fitted over the inner surface of the link-side connecting portion and the outer surface of the rear-end connecting portion, and the inner and outer holding walls of the holding bracket, the lower link-side connecting portion, and the long holes of the rear-end connecting portion are formed. They are connected to each other by a connecting pin that penetrates them, and can exert a stronger check force as compared to a check chain, the runout regulation effect can be improved, and good work is possible even with blade work etc. Become. Further, the sandwiching bracket can reinforce the connecting portion, and the durability can be improved. It has a simpler configuration and can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a plan view of essential parts showing a first embodiment of the present invention, FIG. 2 is an exploded perspective view of the same, FIG. 3 is a sectional plan view of essential parts showing a second embodiment, and FIG. 4 is an exploded view of the same parts. A perspective view and FIG. 5 are rear views showing a conventional example. 1 ... Lower link, 4 ... Tractor car body, 7 ... Insertion hole, 11 ... Connection part, 13 ... Runout control member, 25 ... Rear end connection part, 26 ... Long hole, 27 ... Clamping bracket , 28 …… Inner clamping wall, 29 …… Outer clamping wall, 32 …… Connecting pin.

Claims (1)

[Scope of utility model registration request] 1. A front end portion of a pair of left and right lower links (1) is pivotally connected to both sides of a lower rear portion of a tractor vehicle body (4), and the rear link case side connecting portion (11) and the lower link (1) are connected. )
In a lower link shake restricting device for a tractor in which shake restricting members (13) are mounted respectively between connecting portions (7) in the front-rear direction midway part, the shake restricting member (13) is made of an elongated plate material, Rear end connecting part (25) of the shake restricting member (13)
An elongated hole (26) is formed in the front-rear direction, and the U-shaped holding bracket (27) extends over the inner surface of the lower link (1) side connecting portion (7) and the outer surface of the rear end connecting portion (25). Is fitted outside, and the inner and outer holding walls (28) (2) of the holding bracket (27)
9), the lower link (1) side connecting portion (7) and the rear end connecting portion (25) are connected to each other by a connecting pin (32) penetrating through the long holes (26) of the tractor. Link runout control device.