JPH10201327A - Tractor mid mower lifting device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To simplify a lifting / lowering interlocking mechanism using a lift cylinder 5 of a mower deck 2 of a mid mower. A lift that moves up and down the mower deck 2 by hydraulic expansion and contraction between a rear end of a mower deck 2 suspended vertically below a vehicle body 1 and a bottom of a transmission case 4 between left and right rear wheels 3. Configuration of a tractor mid mower elevating device provided with a cylinder 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating device for elevating and lowering a mid mower mounted on a tractor below a vehicle body.

[0002]

In the mid mower, the size and weight are generally reduced, but the lifting mechanism for raising and lowering the mower deck cannot be freely set in many cases due to the limitation of the wheel base and the vehicle height.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a hydraulic system in which a hydraulic unit is provided between a rear end of a mower deck 2 suspended vertically below a vehicle body 1 and a bottom of a transmission case 4 between left and right rear wheels 3. The tractor has a configuration of a mid mower elevating device provided with a lift cylinder 5 for elevating and lowering the mower deck 2.

[0004]

The lifting and lowering of the mower deck 2 suspended from the lower part of the vehicle body 1 is performed by expansion and contraction of a lift cylinder 5 provided between the rear end of the mower deck 2 and the bottom of the transmission case 4 at the rear. The height of the mower deck 2 can be freely adjusted or operated from the cutting position where the mower deck 2 approaches the ground to the non-cutting position. For this reason, the lift cylinder 5 is disposed between the rear end of the mower deck 2 and the bottom of the transmission case 4 immediately behind the mower deck 2, so that a special complicated work such as a detour to the front from the three-point link mechanism on the rear side of the vehicle body. A simple configuration can be achieved without forming a detour link mechanism, etc., and the lift of the mower deck 2 can be sufficiently maintained.
Even if the mower deck 2 is pushed up from the ground side during the work, it is easy to adopt a configuration that can absorb the pushing up from the mower deck 2 side, and it is possible to have a configuration that is safe and does not damage the lift cylinder 5. .

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A tractor body 1 integrally connects a clutch housing 6 and a transmission case 4 from a front engine E, and a pair of left and right front wheels 8 is attached to a front axle bracket 7 on the front. A pair of left and right rear wheels 3 is mounted on the side end of a rear axle housing 9 which extends from the rear transmission case 4 to both right and left sides. The rear-wheel drive traveling mode is transmitted through a transmission mechanism in the housing 6, the transmission case 4, and the like. Further, a PTO shaft 10 is disposed on the rear side of the transmission case 4. 11 is a steering wheel,
12 is a cockpit, and 13 is a fender.

[0006] On the lower surface of the front part of the transmission case 4, PT
An O-axis transmission case 14 is attached, and a sub-PTO
The shaft 15 is projected to take out power from the sub PTO shaft 15 to the mid mower. A hitch bracket 16 is attached to the rear lower surface of the transmission case 4 by tightening bolts 17. This hitch bracket 1
Lower end portions 18 of the left and right rear axle housings 9 protrude from both left and right sides of the mounting surface 6 to protect the mounting portions. Reference numeral 19 denotes a vertical connecting pin hole formed in the rear portion of the hitch bracket 16, and reference numeral 20 denotes a horizontal connecting pin hole.

In the mower deck 2, an input gear case 21 is mounted at the center front part, a blade shaft is provided directly below the input gear case 21, the blade is rotated, and a belt is stretched between the blade shafts mounted on the left and right rear parts. The upper surface is covered with a belt cover 22, and a discharge port 23 for discharging the cut grass is formed on one side in the form of a triaxial blade cutter mower. Reference numeral 24 denotes a gauge wheel disposed on the front side of the mower deck 2, and reference numeral 25 denotes a gauge wheel disposed on the rear side.

The mower deck 2 is located below the vehicle body 1 between the front wheels 8 and the rear wheels 3, and is suspended by a front link 26 and a rear link 27 as a parallel link mechanism so as to be movable up and down. Front link 26
Is supported at the lower end of a link bracket 28 attached to the front end of the front axle bracket 7 by a pin 29 so as to be vertically rotatable, and the rear end is connected to a bracket 30 fixed to the front surface of the mower deck 2 by a pin 31. The front link 26 is provided as a pair of right and left rigid bodies having an appropriate width, and is disposed at the center between the tread between the front wheels 8 and the width of the mower deck.

The rear link 27 has left and right separate structures, and has a front end connected to a link bracket 32 at the rear of the front axle bracket 7 by pins 33 so as to be vertically rotatable, and a rear end at the rear of the mower deck 2. It is connected to the bracket 34 by a pin 35. The sub-PTO shaft 15 and the input shaft 3 of the input gear case 21 on the front mower deck 2
A transmission shaft 3 having a universal joint, an expansion joint, etc.
Connected by 7.

A bracket 38 is provided at the rear end of the mower deck 2 at the center in the width direction. The bracket 38 is opposed to the hitch bracket 16 attached to the lower surface of the transmission case 4 in the front-rear direction, and is expanded and contracted by hydraulic pressure. The front and rear ends of the lift cylinder 5 are connected by pins 39 and 40. The lift cylinder 5 is rotatable up and down around the pin 40 with respect to the hitch bracket 16, but the front end is rotatable up and down around the pin 39, and the front and rear along the longitudinal hole 41 of the bracket 38 in the front and rear direction. When the mower deck 2 is pushed up by the ground pressure, it can be absorbed by sliding between the long hole 41 and the pin 39 even if the lift cylinder 5 is not shortened.

The lift cylinder 5 is located between the lower end portions 18 of the left and right rear axle housings 9 immediately below the rear portion of the transmission case 4 and is attached and connected by a hitch bracket 16, so that the height above the ground is maintained high. Since it is moved up and down together with the front mower deck 2 while expanding and contracting, it is always hidden behind the mower deck 2 and the lift cylinder 5 rarely comes into direct contact with the ground object.

4 to 8 are different from the above example in that:
A lift arm 4 is provided between a lift cylinder 5 provided below the transmission case 4 and a rear end of the mower deck 2.
2 and a lift lot 43 are provided. The lift cylinder 5 is provided with a pin 40 at the rear of the hitch bracket 16.
The lift arm 42 is turned by a boss around an arm shaft 44 provided in the front end of a bracket 47 in the front-rear direction attached to the side ends of the left and right rear axle housings 9. It is provided movably. The lift arm 42 has a central portion connected to the piston 39 of the lift cylinder 5 with a pin 39, and a front side is formed in a left-right bifurcated shape from a boss around the arm axis 44, and is opposed to the front rear link 27. The rear end of the rear link 27 projects slightly rearward from the pin 35 with respect to the bracket 34, and the lift rod 43 connects the pins 45 and 46 between the projection and the front ends of the lift arms 42.

The mower deck 2 can be lowered to the cutting position (FIG. 4) by shortening the lift cylinder 5, and the lift cylinder 5 can be raised to the non-cutting position (FIG. 5) by extending the lift cylinder 5. Since the lift arm 42 and the lift rod 43 are arranged near the inside of the rear wheel 3 on both the left and right sides, it is difficult for the lift arm 42 and the lift rod 43 to come into contact with foreign matter on the cutting ground. The attachment and detachment of the mower deck 2
The attachment and detachment of the front link 26 to and from the link bracket 28 and the attachment and detachment of the bracket 34 to and from the rear link 27 are performed. As shown in FIG. 8, a socket 48 is provided on the side of the bracket 34, and a pin 49 is pressed toward the bracket 34 by a spring 49 in the socket 48.
The pin 35 is pushed into and connected to a pin hole overlapped with a fitting portion of the rear link 27 fitted in the connector 35. When the pin 35 is pulled out against the spring 49, the connection between the bracket 34 and the rear link 27 is released. 50 is a stopper 2 integral with the pin 35 receiving the pressure of the spring 49,
The pin 35 can be guided and guided, and the position where the pin 35 is removed can be locked and maintained.

The front link 26 and the mower deck 2
The connection pin 31 between the side bracket 30 and the side bracket 30 has a detachable structure that can be inserted and removed similarly to the pin 35 in FIG. The pin 29 at the front end of the front link 26 is attached to a pair of left and right plates 53 connected by a horizontal rod 52.
Are linked by The rod 52 can be attached by being engaged with left and right hooks 54 formed at the lower end of the bracket 28 on the front axle bracket 7 side. A lock pin 55 is provided between the plate 53 and the bracket 28.
Are provided in the same configuration as the pins 35 in FIG.

In the vicinity of the pin 33, which is the front fulcrum of the rear link 27, a stopper 56 which can be adjusted vertically downward.
When the mower deck 2 is pushed up from below and comes into contact with the stopper 56, the mower deck 2 is not further raised and does not hit the vehicle body 1 side.

[Brief description of the drawings]

FIG. 1 is a side view of a mid mower.

FIG. 2 is a plan view of a part thereof.

FIG. 3 is an enlarged side view of a hitch bracket.

FIG. 4 is a side view of a mid mower showing another embodiment.

FIG. 5 is a side view showing the operation.

FIG. 6 is a plan view of a part thereof.

FIG. 7 is a side view showing a state where the mower deck is removed.

FIG. 8 is a plan view of a part thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Moor deck 3 Rear wheel 4 Transmission case 5 Lift cylinder

Claims (1)

[Claims] 1. A mower deck 2 is raised and lowered by hydraulic expansion and contraction between a rear end portion of a mower deck 2 suspended vertically below a vehicle body 1 and a bottom of a transmission case 4 between left and right rear wheels 3. A tractor mid mower elevating device provided with a lift cylinder 5.