JP2000236705A - Interlocking shaft of tractor implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it easy to link a PTO interlocking shaft to the chassis of a tractor when attaching and detaching an implement. SOLUTION: An interlocking shaft of a tractor implement is so constituted that an acutely triangular tapered surface 6 is formed on each of tips of spline ridges 5 formed along the shaft on the inside periphery of a spline coupling 4 so that the surface 6 incline from both right and left sides A, B of the ridges 5 toward the central part C on the shaft end side in the spline coupling 4 of the interlocking shaft for interlocking with the implement linked to a tractor chassis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlocking shaft of a tractor working machine, and more particularly to connecting a power-driven working machine such as a cultivator to a tractor body and simultaneously connecting a PTO shaft. Can be used for interlocking.

[0002]

In a spline coupling which engages and disengages in a spline form for interlocking with a PTO shaft, the axial end surface of a spline ridge formed on the inner periphery of the coupling is formed in an arc shape. However, when the arc-shaped distal end face of the spline ridge is fitted with the distal end face of the mating spline shaft, it is fitted when directly contacting the distal end face of the spline ridge of the spline shaft. It may be difficult to match.

[0003]

According to the present invention, a spline coupling 4 of an interlocking shaft 3 for interlocking a working machine 2 connected to a tractor body 1 is provided on an inner periphery of the spline coupling 4 along an axial direction. A tractor working machine having a sharp triangular taper surface 6 which is inclined from the left and right side surfaces A and B of the spline ridge 5 toward the center portion C on the shaft end side at the tip end of the spline ridge 5 formed in a vertical direction. Configuration of the interlocking axis.

[0004]

When the work implement 2 is attached to or detached from the tractor body 1, the interlocking shaft 3 between the body 1 and the work implement 2 can be interlocked by the spline coupling 4 being fitted and removed. can do. At the shaft end of the spline ridge 5 formed on the inner peripheral surface of the spline coupling 4, an acute-angled triangular tapered surface 6 inclined from the left and right side surfaces A and B toward the shaft end side central portion C is formed. Therefore, even if the tip end of the spline ridge of the mating spline shaft comes into contact with the shaft end side central portion C, the sliding into the triangular tapered surface 6 is performed smoothly, and the shaft connection by the spline coupling 4 is performed. It can be performed smoothly and quickly.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION A tractor body 1 has an engine 8 mounted below a front hood 7 and a clutch housing 9 and a transmission case 10 connected to a rear side thereof. 11 has a front wheel 13 which can be steered by a steering handle 12, and a rear wheel 14 on the side of the rear transmission case 10,
The configuration is a riding four-wheel running configuration. 15 is a fender, 16 is a cockpit.

At the rear end of the transmission case 10 at the rear of the vehicle body 1, a lower link 19 interlocked with a lift arm 17 via a lift rod 18 and a top link 20 constitute a three-point link mechanism. , A hitch frame 21 is mounted on the hitch frame 21, and a top pin hook 24 that engages a top pin 23 of a mast 22 of the working machine 2 including a rotary tilling device, and is disposed on the left and right sides of a tilling input shaft 25. A lower pin hook 27 for engaging the lower pin 26 is provided, and the spline coupling 4 is arranged at the center.

The spline coupling 4 has a spline ridge 5 formed on an inner peripheral surface thereof, and an input shaft 25 formed with a spline can be removably fitted to the outer periphery of the work machine 2 side. The spline coupling 4 is supported on the hitch frame 21 by a coupling holder 29 so as to be freely directional, and a PTO shaft 28 at the rear end of the transmission case 10.
And an interlocking shaft 3 having a universal joint, a telescopic shaft, and the like can be connected to rotate between them.

The rotary tilling apparatus serving as the working machine 2 has an input transmission case 30 having an input shaft 25 at the center, a tilling transmission case 31 protruding below one side, and a tilling claw 32 at the lower end. Is mounted on the tilling shaft 33 to form a side drive configuration. 34 is a tillage cover, 35 is a rear cover. Regarding the related structure of the spline coupling 4 supported by the hitch frame 21 and the input shaft 25 of the input transmission case 30 fitted and connected to the spline coupling 4, Spline ridges 5 along the ridges and grooves 36 between the spline ridges 5 are alternately formed. In addition, a spline ridge 37 extending along the axial direction is provided on the outer peripheral surface of the input shaft 25 fitted into the inside.
And the grooves 38 between the spline ridges 37 are formed alternately.

The spline ridges 5 of the spline coupling 4 and the spline ridges 37 of the input shaft 25 sharpen opposing distal edges 39, 40 into a conical shape to form mating groove lines 38, 40. 36. The spline coupling 4 inclines the front and rear side surfaces A and B in the rotational direction at the front end of each spline ridge 5 over a front edge 39 located at the center portion C of the width of the spline ridge 5, An acute triangular tapered surface 6 is formed.
For this reason, the tip of the groove 36 between the adjacent spline ridges 5 has a gap D between the side surfaces A and B of the triangular tapered surface 6.
It is configured to expand over the front end surface or the front end edge 39.

Further, the spline ridge 37 of the input shaft 25 is provided.
The front and rear side surfaces E and F in the rotational direction are formed as inclined surfaces which are inclined over the central portion G with the distal end edge 40 as the central portion G. During the fitting operation of the spline coupling 4 and the input shaft 25, even if the leading edges 39, 40 of the spline ridges 5, 37 come into contact, the spline ridges 5, 37 are in contact with each other due to the sharp and narrow shape. The stagnation of the input shaft 25 is short.
Sliding fitting along the side surfaces A and B of the tip edge 39 in the rotation direction is performed smoothly.

In FIG. 4, the point different from the above example is that the hitch frame 21 is opposed to the top pin hook 24 and the lower pin hook 27 and engages the top pin 23 and the lower pin 26 which are engaged and guided by these. Lock hooks 41 and 42 are provided to prevent the
1, 42 are linked by a rod 43 or the like. The top pin hook 24 of the hitch frame 21 is provided at the upper central portion, and the lower pin hooks 27 are provided at the lower left and right sides, and can both guide the top pin 23 and the lower pin 26 to the rear upper portion. The lock hooks 41 and 42 rotate vertically above the top pin hooks 24 and the lower pin hooks 27 to engage with the top pins 23 and the lower pins 26 guided on the upper surfaces thereof to prevent the rearward disengagement. To prevent. 4
4, 45 are the top hook 41 and the lower hook 42.
Is a rotatable pivot shaft.

The lock hooks 41 and 42 are provided so as to be always rotatable and locked toward the top pin hook 24 and the lower pin hook 27 by the action of the return spring, so that the hitch frame 21 approaches the work machine 2 side. By pressing against the top pin 23 and the lower pin 26, the top pin hook 24, the lower pin hook 27 and the like can be pushed open against the spring and engaged with the pins 23 and 26.

Reference numeral 47 denotes a lock rotating piece which is operated by a lock release lever 46. By pressing the lower pin hook 42 above the locked position above the lower pin hook 42 and the top pin hook 41, the opening rotation can be prevented. The lock rotation piece 47 is rotated upward by the lock lever 46, and the lower pin hook 42 and the like can be opened and rotated by the lever or the like. In such a configuration of the hitch frame 21, the upper and lower top pins 23 and the lower pins 26 can be simultaneously engaged and disengaged by the front and rear parallel movement of the hitch frame 21.

In FIG. 5, the difference from the above example is that the vertical rotation angle of the rear cover 35 with respect to the tillage cover 34 of the tillage device is detected by a tillage depth sensor such as a potentiometer, and the lift arm 17 is moved up and down by hydraulic pressure. A harness that controls the plowing depth so as to maintain the plowing depth at a set position, and connects the controller 48 of the vehicle body 1 and the plowing depth sensor of the plowing device using the controller 48 of the plowing depth control. The tensile force of 49 is detected by the strain sensor 51 and is notified by the alarm buzzer 50, and the lift arm 17 is not lowered. It prevents forgetting to remove the harness connector 52.

The strain sensor 51 is provided on a connector 52 of a harness 49. Body 1 of this connector 52
The side is fixed to a seat frame 53 or the like on the rear side of the cockpit 16, and when the harness 49 on the tilling device side is pulled for some reason, the connector 52 operates, the strain sensor 51 operates, and is input to the controller 48. The cause of the pulling of the harness 49 is when the harness 49 is lifted or lowered with a part of the tilling device hooked on a part of the tilling device, or when the tilling device is removed from the hitch frame 21 when the connector 52 is pulled.
Are inadvertently performed in a connected state.

In FIG. 6, the difference from the above example is that when the lock release lever 46 for releasing the engagement position of the lock hooks 41 and 42 is operated to the release position, the connector 52 of the harness 49 is connected. In this state, the alarm buzzer 50 issues an alarm in a state where the alarm is activated. The lock release position of the lock release lever 46 is ON of the limit switch 53
And the connector 52 is connected to the connector 5
2 can be detected by turning on a limit switch 54 provided in the controller 2 and input to the controller 48 to suppress the lowering of the lift arm 17 or to issue an alarm buzzer 50.

[Brief description of the drawings]

FIG. 1 is a perspective view of an input shaft part, a perspective view of a spline coupling part, and an inner peripheral side view.

FIG. 2 is a side view of the tractor working machine.

FIG. 3 is a perspective view of a working machine connecting portion.

FIG. 4 is a side view of a hitch frame showing a partly different embodiment.

FIG. 5 is a perspective view of a working machine connecting portion showing a partially different embodiment,
The control block diagram of a part.

FIG. 6 is a control block diagram showing a partially different embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Work implement 3 Interlocking shaft 4 Spline coupling 5 Spline ridge 6 Triangular taper surface A side surface B side surface C center part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideaki Saeki 1st Hachikura, Tobe-cho, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd. Within the department (72) Inventor Naru Nagai No. 1 Hachikura, Tobe-cho, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd. Nobuo Fujita 1-Yachikura, Tobe-cho, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd. Engineering Department F-term (reference) 2B041 AA09 AB05 AC03 EB18 3J056 AA04 BA01 BB15 CA02 GA02 GA23

Claims (1)

[Claims] A working machine connected to a tractor body.
The spline coupling 4 of the interlocking shaft 3 for interlocking, the spline projection 5 formed on the inner periphery of the spline coupling 4 along the axial direction, and the spline projection 5
The interlocking shaft of the tractor working machine is formed by forming an acute-angled triangular tapered surface 6 inclined from the left and right side surfaces A and B toward the shaft end side central portion C.