JPH0425385Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an inertial slip prevention device for a PTO shaft in a vehicle such as a tractor.

(Prior art) For example, as shown in Utility Model Application No. 59-85639,
Some tractors have a structure in which a PTO shaft protrudes from the front of the tractor and a working machine such as a mower is attached to it via a universal joint shaft.

(Problems to be solved by the invention) However, even if the clutch is disconnected, the cutter and the like rotate for a while due to inertia, which is dangerous.

In view of the above problems, the present invention aims to prevent the PTO shaft from spinning due to inertia when the clutch is disengaged.

(Means for solving the problem) The technical means is that the PTO shaft 7, to which power is freely disconnected and disconnected by pressing the clutch pedal 60, protrudes from the fuselage 2 at a position close to the clutch pedal 60. , in a vehicle in which power is transmitted to the working machine 12 via a universal joint shaft 19 detachably connected to the tip of a spline portion protruding from the body 2 of the PTO shaft 7, the spline portion of the PTO shaft 7 A brake disc 67 is spline-fitted to the brake disc 67 so as to be detachable from the tip side, and a brake pad 68 facing the brake disc 67 is attached to the brake pad 68.
is provided on the body 2 side, and an operation link 65 that is linked to the clutch pedal 60 is swingably supported on the body 2 side, and when the clutch pedal 60 is depressed, the brake disc 67 is connected to the brake pad 68.
Pressing member 6 that clamps and applies braking to PTO shaft 7
9 is located at the point provided on the operating link 65.

(Function) According to the present invention, when the clutch pedal is depressed, power transmission to the PTO shaft is cut off.
In conjunction with this clutch pedal depression operation, the operating link swings, and the brake disc spline-fitted to the PTO shaft is held between the brake shoe on the aircraft side and the pressing member of the operating link, and the PTO
This brakes the rotation of the shaft, thereby preventing the PTO shaft from spinning due to inertia.

(Embodiment) Hereinafter, an embodiment of the present invention will be described based on the drawings. In FIGS. 1 and 2, 1 is a tractor, 2 is a tractor body, and an engine 3, a clutch housing 4, and a transmission case 5 are It is constructed by consecutively arranging them in the front in the above order.

A pair of front axle cases 6 are provided to protrude left and right from both sides of the front part of the transmission case 5, and a front PTO shaft 7 is provided to protrude forward from the front surface of the transmission case 5.

8 is a front wheel, 9 is a rear wheel serving as a steering wheel, 10 is a seat, and 11 is a steering wheel.

Reference numeral 12 denotes a front mount mower, which is detachably attached to the front of the machine body 2 via a connecting link 13, a hanging device 14, and a lifting device 15 in a state offset to the left, and is located in front of the front wheels 8.

The mower 12 has a mower deck 1 that opens downward.
6, and below the mower deck 16, three sets of rotary cutting blades are arranged substantially in the left-right direction.

An input case 18 having an input shaft 17 is provided at the center in the left-right direction of the mower deck 16, and the input shaft 17 is connected to the front PTO shaft 7 via a universal joint shaft 19.
is connected to.

At the front edge of the mower deck 16, a pair of left and right front gauge wheels 20 for adjusting the cutting height are provided so as to be movable and adjustable in the vertical direction, and at the center of the front edge of the mower deck 16 in the left and right direction, a front limit gauge wheel is provided. A pair of left and right rear limit gauge wheels 22 are provided at the rear edge of the mower deck 16, respectively, and these limit gauge wheels 22 prevent the mower deck 16 from touching the ground.

There are a pair of connecting links 13 on the left and right, and they are non-bendable and have a substantially U-shaped shape when viewed from the side. At the rear end, there is a bracket 2 fixedly attached to the front axle case 6.
3 is provided so as to be swingable in the vertical direction around a pivot shaft 24 in the left and right direction.

A ball joint part 25 is provided at the front end of each link 13, and a mower deck 16 is attached to this ball joint part 25.
The front left and right sides each have a bracket 26 and a pivot shaft 2.
It is provided rotatably via 7.

Note that when the mower 12 is in a normal working state as shown in FIG.
7, and when the tractor 1 pushes the mower 12 during work, a downward pressing force is not applied from the tractor 1 to the mower 12 via the connecting link 13, and as a result, the mower 1
2 is designed to easily overcome obstacles.

The connecting link 13 includes front and rear link bodies 28 and 29
and a fixing device 30 that connects both link bodies 28 and 29 in a separable manner.

The rear link body 29 includes a pair of left and right side plates 31, and an insertion frame 32 that is fixed to the front part of the side plates 31 and into which the rear part of the front link body 28 is removably inserted.

There are a pair of hanging devices 14 on the left and right, and a mower deck 16 is provided at the front of the rear link body 29 of each connecting link 13.
The left and right sides of the rear part are suspended, and the mowing height can be adjusted.

As shown in FIG. 3, the lifting device 15 lifts and lowers the mower 12 via a connecting link 13 and a hanging device 14, and is configured as follows.

That is, a pair of left and right support plates 43 protrude forward from both sides of the front portion of the mission case 5, and a left and right cylinder 44 is fixed to both support plates 43.

A rotation shaft 45 is rotatably inserted into the cylinder 44. A pair of left and right interlocking levers 46 are fixed to both ends of the rotation shaft 45 so as to project forward.
An operating lever 47 is fixedly provided on the left side in a downwardly projecting manner.

Reference numeral 48 denotes a double acting type hydraulic cylinder, which is interposed between the operating lever 47 and the left bracket 23.

Reference numeral 49 denotes a pair of left and right hanging members, including a U-shaped member 51 having a pair of left and right side plates 50 connected at the upper part and having an inverted U shape, and a nut fixed to the lower end of the U-shaped member 51. 52 and a connecting shaft 53 screwed to the nut 52.

A connecting lever 4 is provided between the side plate portions 50 of the U-shaped member 51.
6 are movably inserted, and these connect to the connecting pin 5.
4, they are separably connected.

The connecting pin 54 is movably inserted into the elongated hole 55 of the U-shaped member 51, and this movement allows each connecting link 13 to swing independently, allowing the entire mower 12 to move vertically and tilt in the horizontal direction. be done.

The connecting shaft 53 connects to the inner side plate 31 of the rear link body 29.
It is connected to the rear bracket 56 of a plurality of front and rear brackets 56 by a connecting pin 57.

Reference numeral 60 denotes a clutch pedal, which is rotatably provided around a pedal shaft 61 at the front of the machine body 1, and is operatively connected to the clutch via a clutch rod 62.
Then, by depressing the clutch pedal 60, the clutch is freely disconnected and disconnected via the clutch rod 62, and the power transmission system is disconnected.

Furthermore, as shown in FIGS. 1 and 2, a braking mechanism 6 that is linked to the depression operation of the clutch pedal 60
2 is provided at the lower part of the front part of the fuselage 1.

The braking mechanism 62 includes an operating link 65 that is swingably supported on the fuselage 1 around a support shaft 64, an operating rod 66 that interlocks and connects the operating link 65 and the clutch pedal 60 side, and a front PTO shaft 7. An operation link 65 is used to clamp and brake a brake disc 67 that is removably spline-fitted to the spline portion.
A brake pad 68 is provided on the front surface of the transmission case 5 facing the pressing member 69 at the tip.

When the clutch pedal 60 is depressed, the power transmission system to the PTO shaft 7 is disconnected via the clutch rod 62, and the operating rod 66 is actuated. This swinging operation of the operating link 65 pushes the brake disc 67 rearward. Then, the brake disc 67 is held between the pressing member 69 of the operation link 65 and the brake pad 68, and the front PTO shaft 7 is held here.
This can effectively prevent inertial slippage.

Furthermore, when braking by the brake disc 67 is not required, the brake disc 67 can be easily removed from the front PTO shaft 7.

Furthermore, since the clutch pedal 60 and the front PTO shaft 7 are arranged close to each other, the braking mechanism 63 can be easily constructed.

Further, the front link body 28 is provided with an auxiliary bracket 69 for attaching an auxiliary link 70, and as shown by the phantom line in FIG. 2, a working machine such as a snow blower 71 or a front blade is attached to the bracket 69. still,
The auxiliary link 70 may be a hydraulic cylinder. Further, if the amount of downward play can be reduced in a heavy working machine such as the snow blower 7, the hanging member 49 may be connected to the front bracket 56.

(Effect of the invention) According to the invention, the PTO shaft 7 to which power is freely disconnected by pressing the clutch pedal 60
However, the aircraft 2 is in a position close to the clutch pedal 60.
In a vehicle that transmits power to a working machine via a universal joint shaft 19 that protrudes from the PTO shaft 7 and is removably connected to the tip of the spline portion of the PTO shaft 7, the spline portion of the PTO shaft 7 has a A brake disc 67 is spline-fitted to be removably attached to the brake disc 67, a brake pad 68 facing the brake disc 67 is provided on the fuselage 2 side, and an operating link 65 interlocked with the clutch pedal 60 is connected to the fuselage 2.
The operating link 65 is provided with a pressing member 69 that is swingably supported on the side and applies braking to the PTO shaft 7 by sandwiching the brake disc 67 with the brake pad 68 when the clutch pedal 60 is depressed. Therefore, when the clutch pedal 60 is depressed, the power transmission system to the PTO shaft 7 is disconnected, the operating link 65 swings, and the pressing member 69
The brake disc 67 is sandwiched between the brake pad 68 and the brake pad 68, and the PTO shaft 7 is braked.
Inertial idling of the PTO shaft 7 can be effectively prevented.

Further, the brake disc 67 is removably spline-fitted to the PTO shaft 7 using a spline portion protruding from the fuselage 2, and this brake disc 67 is connected to the brake pad 6 on the fuselage 2 side.
8 and the pressing member 69, the structure is simple and can be implemented at low cost.

Further, since the brake disc 67 is removably spline-fitted to the spline portion of the PTO shaft 7 from the distal end thereof, it can be easily removed by removing the universal joint shaft 19 when unnecessary.

Further, since the clutch pedal 60 and the PTO shaft 7 are close to each other, there is an advantage that the entire mechanism including the interlocking mechanism between the operation link 65 and the clutch pedal 60 is simplified.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is an overall side view, FIG. 2 is an enlarged view of the main part, and FIG. 3 is a partially enlarged view of FIG. 2. 2...Tractor body, 7...Front PTO shaft, 6
0...Clutch pedal, 63...Brake mechanism, 67
...brake disc.

Claims (1)

[Scope of utility model registration request] A PTO shaft 7, to which power is freely disconnected and disconnected when the clutch pedal 60 is depressed, protrudes from the fuselage 2 at a position close to the clutch pedal 60, and a spline portion of the PTO shaft 7 protrudes from the fuselage 2. In a vehicle in which power is transmitted to a work machine via a detachably connected universal joint shaft 19, a brake disc 67 is spline-fitted to the spline portion of the PTO shaft 7 in a detachable manner from the tip side, A brake pad 68 facing this brake disc 67 is provided on the fuselage 2 side,
An operation link 65 that is linked to the clutch pedal 60 is pivotally supported on the body 2 side, and when the clutch pedal 60 is depressed, a brake disc 67 is held between it and the brake pad 68 to apply braking to the PTO shaft 7. An inertial slip prevention device for a PTO shaft in a vehicle, characterized in that a pressing member 69 is provided on an operating link 65.