JPH052A - Assist cylinder apparatus of hydraulic lift arm in tractor - Google Patents

Abstract

PURPOSE:To prevent an assist cylinder from hindering oscillation of lowering or from hindering variation of a cross member of automatic hitch, etc. CONSTITUTION:In a tractor constituted so as to supplement lifting force of a lift arm 7 by an assist cylinder 17, one end of the above-mentioned assist cylinder 17 is coupled to the lift arm 7 and arranged therefrom at the back of nearly horizontal direction and other end of the assist cylinder 17 is coupled on a tractor body 1 side at the back of the lift arm 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assist cylinder device for a hydraulic lift arm of a tractor.

[0002]

2. Description of the Related Art In a tractor, as shown in FIG. 2, one end of a pair of left and right lower links 31 is vertically movably connected to a tractor body 32, and a pair of left and right lift arms of a hydraulic device 33 provided in the tractor body 32. 34 and the lower link 31 are connected to each other by a lift rod 35, and the lift arm 34 and the tractor body are connected.
There is one in which an assist cylinder 36 is connected to the 32 side, and the assisting force of the lift arm 34 is supplemented by the assist cylinder 36. However, in the conventional type of this type, as shown in the same figure, one end of the assist cylinder 36 is connected to the lift arm 34, and the lift arm 34 is arranged substantially vertically downward from there, and The end was connected to a bracket 37 or the like protruding from the tractor body 32.

[0003]

Therefore, in the conventional case, there is a problem that the lower portion of the assist cylinder 36 is in a state of being close to the lower link 31, which restricts the swing of the lower link 31. Further, since the assist cylinder 36 is arranged along the rear end portion of the tractor vehicle body 32, it may not be possible to cope with variations of cross members such as an auto hitch.

In view of the above problems, the present invention is such that the assist cylinder does not interfere with the swing of the lower link or the variation of cross members such as an auto hitch.

[0005]

According to the technical means of the present invention for solving the technical problem, one end of each of a pair of left and right lower links 10 is connected to a tractor body 1 so as to be vertically movable.
A pair of left and right lift arms 7 of the hydraulic device 5 provided in the tractor body 1 and the lower link 10 are connected by lift means 11, and an assist cylinder 17 is connected to the lift arm 7 and the tractor body 1 side. In the tractor in which the lift force of the lift arm 7 is supplemented by the cylinder 17, the assist cylinder 17 has one end connected to the lift arm 7 and disposed rearward in a substantially horizontal direction from the other end of the assist cylinder 17. Is connected to the tractor body 1 side behind the lift arm 7.

[0006]

[Operation] Since the assist cylinder 17 is arranged rearward from the base end portion of the lift arm 7, it is in a state of being largely separated upward with respect to the lower link 10, and the assist cylinder 17 restricts the swing of the lower link 31. Fear disappears. Further, the assist cylinder 17 does not extend along the rear end portion of the tractor vehicle body 1, and the assist cylinder 17 becomes an obstacle, and there is no fear that the variation of the cross member such as the auto hitch cannot be coped with.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIG. 1, reference numeral 1 is a tractor body, and inside thereof, there are a traveling system and a PTO system mission, and the traveling system is a rear axle. The left and right rear wheels 3 can be driven via 2 and the PTO
The system is linked to the PTO shaft 4.

Reference numeral 5 denotes a hydraulic device for raising and lowering the working machine, which is provided with a hydraulic housing 6 mounted on the rear upper surface of the tractor vehicle body 1. Inside the housing 6, a cylinder, a piston, etc. are provided, and a pair of left and right is provided. The lift arm 7 can be raised and lowered. 8 is a three-point link mechanism, and the center top link 9
And a pair of left and right lower links 10, each lower link 10 and the lift arm 7 are connected by a lift means 11, and one of the lift means 11 is an extendable cylinder 12, which is a horizontal posture of the working machine. Are controllable.

Reference numeral 13 is a wheel fan, 14 is a rear axle case, and 15 is a check chain. Reference numeral 17 denotes a pair of left and right assist cylinders, which apply a lifting force to each lift arm 7 when the hydraulic device 5 is insufficient in the amount of force, and are arranged on both sides of the hydraulic housing 6. One end of each assist cylinder 17 is connected to the lift arm 7 and is arranged rearward in a substantially horizontal direction from the lift arm 7, and the other end of the assist cylinder 17 is a hydraulic housing behind the lift arm 7.
6 Connected to the rear.

[0010]

According to the present invention, the assist cylinder 17
Of the assist cylinder 17 is connected to the lift arm 7 and arranged rearward in a substantially horizontal direction, and the other end of the assist cylinder 17 is connected to the tractor body 1 side behind the lift arm 7, so that the assist cylinder 17 is There is no fear of disturbing the swing of the lower link 10 or variation of cross members such as an auto hitch, and the assisting cylinder 17 can effectively supplement the lifting force of the lift arm 7.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a side view showing a conventional example.

[Explanation of symbols]

 1 tractor body 5 hydraulic system 7 lift arm 10 lower link 17 assist cylinder

Claims (1)

Claims: 1. A pair of left and right lower links (10) are connected at one end thereof to a tractor vehicle body (1) so as to be movable up and down.
A pair of left and right lift arms for the hydraulic system (5) provided for (1)
(7) and the lower link (10) are connected to each other by a lift means (11), and an assist cylinder (17) is connected to the lift arm (7) and the tractor body (1) side. ) Of the lift arm (7) to supplement the lifting force of the lift arm (7), the assist cylinder (17) is connected to the lift arm (7) at one end and is arranged rearward in a substantially horizontal direction from the lift arm (7). An assist cylinder device for a hydraulic lift arm in a tractor, wherein the other end of the cylinder (17) is connected to the tractor body (1) side behind the lift arm (7).