JP3684735B2 - Tractor midmower lifting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an elevating device that elevates and lowers a mid mower mounted on a lower side of a vehicle body of a tractor.
[0002]
[Problems to be solved by the invention]
Mid mowers are generally small and light, but are limited to wheel bases, vehicle heights, etc., and in many cases a lifting mechanism for raising and lowering a moor deck cannot be freely set.
[0003]
[Means for Solving the Problems]
The present invention relates to a tractor that hangs a mower deck 2 in a lower part of a vehicle body 1 so as to be movable up and down .
The lower part of the vehicle body 1 and the front part of the mower deck 2 are connected by a pair of left and right front links 26, and the lower part of the vehicle body 1 and the rear part of the mower deck 2 are connected by a pair of left and right rear links 27 to constitute a parallel link mechanism. As well as
A single lift cylinder 5 that can be expanded and contracted by hydraulic operation is pivotally attached to the lower middle part of the transmission case 4 between the rear end of the mower deck 2 and between the left and right rear wheels 3. The tractor midmower lifting device is characterized in that it is slidably connected back and forth with a longitudinal hole 41 extending rearward from the rear end of the mower deck 2 .
[0004]
【The invention's effect】
In the configuration the tractor as described above, the lower portion of the vehicle body 1, via a parallel link mechanism, hanging the mower deck 2, the lift cylinder 5, by expanding and contracting at the rear portion behind the mower deck 2, close to the ground The height is adjusted or operated freely from the cutting position to be moved to the non-cutting position .
Also this lift cylinder 5, a single, for placement in the transmission case 4 below between the wheel 3 after and left and right behind the rear end of the mower deck 2, can be a simple configuration, the mower deck 2 Sufficient head can be maintained.
Further, since the lift cylinder 5 is hidden behind the mower deck 2 during operation, it is possible to prevent direct contact with ground objects as much as possible, and the piston portion of the cylinder 5 is connected to the rear end of the mower deck 2. since relative long hole 41 in the longitudinal direction to extend rearward from the parts in the configuration of the connecting slidably, even if the mower deck 2 is pushed up from the ground side, of without this reducing the same cylinder 5 The push-up can be absorbed and damage to the cylinder 5 can be prevented .
[0005]
【Example】
The tractor vehicle body 1 integrally connects a clutch housing 6 and a transmission case 4 from a front engine E, and a front axle bracket 7 in the front part includes a pair of left and right front wheels 8 with a front axle housing and the like interposed therebetween. A pair of left and right rear wheels 3 are mounted on the side end portion of the rear axle housing 9 that is axially mounted and extends from the rear transmission case 4 over both left and right sides. The rear wheel drive traveling mode is such that transmission is performed via a transmission mechanism in the case 4 or the like. A PTO shaft 10 is disposed on the rear side of the mission case 4. 11 is a steering handle, 12 is a cockpit, and 13 is a fender.
[0006]
A PTO shaft transmission case 14 is attached to the lower surface of the front portion of the transmission case 4, and a sub PTO shaft 15 projects from the front side so that power can be extracted from the sub PTO shaft 15 to the mid mower.
A hitch bracket 16 is attached to the rear lower surface of the mission case 4 by tightening bolts 17. Lower end portions 18 of the left and right rear axle housings 9 protrude from the left and right side portions of the mounting surface of the hitch bracket 16 so as 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 20 denotes a horizontal connecting pin hole.
[0007]
The moor deck 2 is provided with an input gear case 21 at the center front, and a blade shaft is provided immediately below this to rotate the blade. A belt is stretched between the blade shaft mounted on the left and right rear portions, and the upper surface is Covered with a belt cover 22, a discharge port 23 for discharging cut grass is formed on one side in the form of a triaxially arranged blade cutter mower. Reference numeral 24 denotes a gauge wheel arranged on the front side of the mower deck 2, and 25 denotes a gauge wheel arranged on the rear side.
[0008]
The moor deck 2 is positioned between the front wheel 8 and the rear wheel 3 in the lower part of the vehicle body 1 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. The front link 26 is supported at the lower end of a link bracket 28 attached to the front end portion of the front axle bracket 7 by a pin 29 so as to be pivotable up and down, and the rear end portion is fixed to a bracket 30 fixed to the front of the mower deck 2 with a pin 31. Link. The front link 26 is provided as a pair of left and right rigid bodies with an appropriate width, and is disposed at the center of the tread between the front wheels 8 and the mower deck width.
[0009]
As for the rear link 27, the front end is connected to the link bracket 32 at the rear of the front axle bracket 7 by a pin 33 so as to be pivotable up and down, and the rear end is connected to the bracket 34 at the rear of the mower deck 2. The pins 35 are connected.
The sub PTO shaft 15 and the input shaft 36 of the input gear case 21 on the front mower deck 2 are connected by a transmission shaft 37 having a universal shaft joint, an expansion shaft joint and the like.
[0010]
A lift cylinder 5 having a bracket 38 at the center in the width direction at the rear end of the moor deck 2 and extending in the front-rear direction against the hitch bracket 16 attached to the lower surface of the transmission case 4 and extending and contracting by hydraulic pressure. Are connected by pins 39 and 40. The lift cylinder 5 can be pivoted up and down around the pin 40 with respect to the hitch bracket 16, but the front end of the piston part can be pivoted up and down around the pin 39 and along the long hole 41 in the front-rear direction of the bracket 38. When the mower deck 2 is pushed up by the ground pressure, it can be absorbed by the sliding of the long hole 41 and the pin 39 even if the lift cylinder 5 is not shortened.
[0011]
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 the hitch bracket 16, so that the height to the ground is also maintained high, and it expands and contracts. However, since it is moved up and down together with the front mower deck 2, it is always hidden behind the mower deck 2, and the lift cylinder 5 is rarely in direct contact with the ground object.
[0012]
In Figures 4-8, different from the above example, between the lift cylinder 5 and the mower deck 2 of the rear end portion which is provided on the lower side of the transmission case 4, is provided with a lift arm 42 and Rifutoro' de 43 Is. The lift cylinder 5 is connected to the rear portion of the hitch bracket 16 by a pin 40, and the lift arm 42 is provided in the front end portion of the bracket 47 in the front-rear direction attached to the side end portions of the left and right rear axle housings 9 in the lateral direction. Around the arm shaft 44, a boss portion is provided so as to be rotatable. The lift arm 42 has a central portion connected to the piston of the lift cylinder 5 and a pin 39, and a front side from the boss portion around the arm shaft 44 is formed in a bifurcated shape so as to face the front rear link 27. The rear end portion of the rear link 27 protrudes slightly rearward from the pin 35 with respect to the bracket 34, and the pins 45 and 46 are connected by a lift rod 43 between the protruding portion and the front end portion of each lift arm 42.
[0013]
The lift cylinder 5 can be shortened to lower the mower deck 2 to the cutting position (FIG. 4), and the lift cylinder 5 can be extended to the non-cutting position (FIG. 5). Since the lift arm 42 and the lift rod 43 are disposed near the inside of the rear wheels 3 on both the left and right sides, the lift arm 42 and the lift rod 43 are unlikely to come into contact with foreign matter on the cutting ground.
The moor deck 2 is attached / detached by attaching / detaching the front link 26 to / from the link bracket 28 and attaching / detaching the bracket 34 to / from the rear link 27. As shown in FIG. 8, a socket 48 is provided on the side of the bracket 34, and the pin 35 is pressed toward the bracket 34 by a spring 49 in the socket 48, and the rear link 27 is fitted into the bracket 34. The pin 35 is pushed into and connected to the pin hole overlapped with the fitting portion with the combined rear link 27. When the pin 35 is pulled out against the spring 49, the bracket 34 and the rear link 27 are disconnected. 50 is a stopper 2 integral with the pin 35 that receives the pressure of the spring 49, and can be guided in the pin groove 51 of the socket 48, so that the removed position of the pin 35 can be maintained.
[0014]
Further, the connecting pin 31 between the front link 26 and the bracket 30 on the mower deck 2 side is also a detachable structure that can be inserted and removed in the same manner as the pin 35 of FIG. The pin 29 at the front end of the front link 26 is connected by a pin 29 to a pair of left and right plates 53 connected by a lateral rod 52. The rod 52 can be attached by engaging 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 in the same configuration as the pin 35 of FIG. 8 to prevent the plate 53 from rotating.
[0015]
Also, a stopper 56 that can be adjusted up and down is provided near the pin 33 that is the front fulcrum of the rear link 27. When the mower deck 2 is pushed up from the lower side and comes into contact with this stopper 56, no more It is intended not to be raised and hit the vehicle body 1 side.
[Brief description of the drawings]
FIG. 1 is a side view of a midmoor.
FIG. 2 is a plan view of a part thereof.
FIG. 3 is an enlarged side view of a hitch bracket portion.
FIG. 4 is a side view of a midmoor 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]
1 Car body 2 Moore deck 3 Rear wheel 4 Mission case 5 Lift cylinder
26 Front link
27 Rear link
41 long hole

Claims (1)

In the tractor that hangs the mower deck 2 in the lower part of the vehicle body 1 so as to be movable up and down ,
The lower part of the vehicle body 1 and the front part of the mower deck 2 are connected by a pair of left and right front links 26, and the lower part of the vehicle body 1 and the rear part of the mower deck 2 are connected by a pair of left and right rear links 27 to constitute a parallel link mechanism. As well as
A single lift cylinder 5 that can be expanded and contracted by hydraulic operation is pivotally attached to the lower middle part of the transmission case 4 between the rear end of the mower deck 2 and between the left and right rear wheels 3. A mid-mower lifting device for a tractor characterized by being connected to a longitudinal hole 41 extending rearward from the rear end portion of the moor deck 2 so as to be slidable back and forth .

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