JPS5836913Y2 - Transmission shaft inertia slip prevention device for tractors, etc. - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for preventing the propulsion shaft of an agricultural tractor from idling due to inertia.

Generally, in vehicles such as agricultural tractors, a main clutch is provided between the engine and the propulsion shaft, and the power from the propulsion shaft to the transmission mechanism is interrupted or interrupted by important operation of this main clutch. Even if the main clutch is disengaged to cut off power transmission, the propulsion shaft continues to idle due to its inertia, which impedes gear shifting operations and causes unpleasant gear noise and gear loss.

In order to prevent such inconvenience, the present invention relates to a device that brakes the propulsion shaft in conjunction with the disengagement operation of the main clutch.In particular, the purpose of the present invention is to provide a brake receiver on the propulsion shaft so that the main clutch can be braked. In a device that applies a brake to the brake receiver in conjunction with the disengagement of the clutch, thereby braking the propulsion shaft, a device is provided that can easily adjust the gap between the brake and the brake receiver. This is what we intend to provide.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below based on a drawing showing an embodiment of the present invention implemented in an agricultural tractor.

In FIG. 1, 1 is a clutch housing connected to the rear part of an engine (not shown), and this clutch housing 1 has a PTO drive shaft 2 that drives a working machine.
The clutch housing 1 is supported by penetrating through the clutch housing 1, and its front end is loosely fitted and supported at the center of the engine flywheel 3.
The propulsion shaft 4 as the transmission shaft of the present invention is the PTO drive shaft 2.
It is rotatably fitted on the outside.

Reference numeral 5 denotes a support wall that projects toward the center from the inner wall of the clutch housing 1, and the intermediate portion of the propulsion shaft 4 is supported by this support wall 5 via a bearing 6.

On the other hand, a main clutch hub 7 is attached to the tip of the propulsion shaft 4, and a main clutch friction plate 8 is attached to the main clutch hub 7.

9 is a clutch case 10 attached to the flywheel 3
Inside, there is a pressure plate placed at the rear of the friction plate 8, and a plate spring 12 provided between the cutout of the pressure plate 9 and the protruding wall 11 of the clutch case 10 moves the friction plate 8 into the clutch case 10. The other protruding wall 13 and the pressure plate 9 are brought into pressure contact.

Reference numeral 14 denotes a clutch lever pivotally supported at the rear of the clutch case 10, and by rotating this lever 14 forward, the pressure plate 9 is moved rearward and the main clutch is disengaged.

Next, 15 is a cylindrical sleeve guide that is fitted onto the propulsion shaft 4 and whose rear end is bolted to the support wall 5, and this sleeve guide 15 has a release bearing 16 at its tip. The release sleeve 17 is fitted onto the outside so that it can freely slide in the axial direction.

A release shaft 18 is mounted in the clutch housing 1 above the release sleeve 17.
, its tip is in the groove 19 on the outer periphery of the release sleeve 17.
A release yoke 20 is attached to the release shaft 18, and a main clutch lever 21 is attached to the outer end of the release shaft 18.

On the other hand, the main clutch lever L/22 is rotatably supported on the rear wall of the mission case 23, and a connecting rod 24 is provided in the middle thereof, and the tip of the connecting rod 24 and the clutch lever 21 are connected to each other. The tip of the main clutch lever 21 and the release yoke 20 are connected by a tongue buckle 25, and when the main clutch pedal 22 is depressed, the main clutch lever 21 and the release yoke 20 are connected to each other by a tongue buckle 25.
, the release sleeve 17 slides, and the release bearing 16 rotates the release lever 14 forward to disengage the main clutch.

Although the explanation has been omitted, in this embodiment, when the main clutch pedal 22 is further depressed, the PTO shaft clutch 26 is engaged.

Now, the mechanism of the main clutch is as described above, and next, details of the propulsion shaft braking device according to the present invention will be explained based on FIG. 2 and subsequent figures.

As shown in FIG. 2, a spline collar 27 having a spline on the outer periphery is fitted onto the propulsion shaft 4 on the rear side of the support wall 5 in a press-fit state so as to rotate integrally with the propulsion shaft 4. The spline collar 27 has a cylindrical shape and is provided with a flange 28 at its rear end.
A brake receiver 29 having brake receiving surfaces 29a and 29b on both front and rear surfaces thereof is spline-fitted to the cylindrical portion thereof so as to be slidable back and forth.

Reference numeral 30 denotes a spring receiving flange formed at the rear end of the spline collar 270, and a return spring 31 is interposed between this flange 30 and the rear end of the brake receiver 29 to allow the brake receiver 29 to slide forward. It is kept in the same condition.

Reference numeral 32 denotes a friction plate consisting of a base plate 33a and an annular lining 33b attached to the rear side of the base plate 33a. It is fitted onto the outside of the cylindrical part so that it can slide forward and backward.

Further, 34 is another friction plate which similarly consists of a base plate 35a and an annular lining 35b attached to the front side of the base plate 35a, and similarly faces the rear side brake receiving surface 29b of the brake receiver 29. , are externally fitted onto the spline collar 27, and in this embodiment constitute a pair of brake tools.

Furthermore, 36 is a support bolt whose front end is screwed into the support wall 5, and this support bolt 36 is a kind of stepped bolt as shown in FIG. 5, but the rear end is as shown in FIG. As shown in FIG. 3, this rear friction is secured by a bolt 37 that passes through the left and right guide holes 32a of the front friction plate 32, is inserted into the mounting hole 43 of the rear friction plate 34, and is screwed to the rear end. The plate 34 is held in a fixed state.

Therefore, the front friction plate 32 is movable in the front-rear direction, but the rear friction plate 34 is immovable.

Further, between the front side friction plate 32 and the side surface of the bearing 6 that supports the middle of the propulsion shaft 4, there is a suppression spring 38 energized to move the front side friction plate 32 rearward. It has been intervened.

Next, reference numeral 39 denotes a brake shaft mounted in the clutch housing 1 below the propulsion shaft 4, and a U-shaped brake yoke 40 is attached to this brake shaft 39, as shown in FIG. The tip of the brake yoke 40 is in contact with both left and right protrusions 41 of the front side friction plate 32.

The front end of a rotating rod 42 is inserted and attached to the outer end of this brake shaft 39, and the action of this rotating rod 42 causes the brake yoke 40 to move the front side friction plate 32 toward the pressing spring 38. These friction plates 32. are moved forward against the force.
34 and the brake receiver 29, a suitable gap 11,12 is maintained.

The rotary rod 42 is connected in conjunction with the turning operation of the main clutch pedal 22, and its structure is as follows.

Therefore, this will be explained based on FIG. 6 and FIG. 7. In the same figure, the connecting rod 24 protruding from the main clutch pedal 22 has a rear end of the tongue buckle 25 as well as a guide tool of the present invention. A guide plate 44 is pivotally mounted,
A vertically long elongated hole 45 is formed at the lower end of the guide plate 44, and the rotary rod 4 is inserted into this elongated hole 45.
An L-shaped layered bending portion 46 formed at the rear end of 2 is inserted so as to be vertically movable.

Similarly, the long hole 4 47 is located below the bent portion 46.
It is an adjustment bolt as a support tool inserted in 5,
It is fixed in an appropriate position by a bolt locking nut 48 screwed onto the bolt 47.

Reference numeral 49 denotes an adjustment plate as an adjustment tool having a vertically long elongated hole 50. The tip of the adjustment bolt 47 is inserted into the elongated hole 50, and the adjustment nut 51 screwed into the tip of the adjuster bolt 47 is inserted into the elongated hole 50. The adjustment plate 49 is fixed at an appropriate position, and the upper end of the adjustment plate 49 abuts the bent portion 46 of the rotation rod 42 to prevent the rotation rod 42 from rotating downward.

That is, although the rotation rod 42 is always subjected to downward rotation force by the suppression spring 38, this is prevented by the adjustment plate 49, and the friction plate 32
, 34 and the brake receiver 29 to maintain appropriate gaps l, , 12.

Now, to explain the effect based on the above configuration, first,
When the main clutch pedal 22 is depressed and rotated downward,
As described above, the release sleeve 17 slides, the release lever 14 rotates, and the main clutch is disengaged.

By the downward rotation of the main clutch pedal 22, the guide plate 44 also moves downward, and at the same time, the adjustment plate 49 also moves downward, allowing the rotation rod 42 to rotate downward.

As a result, the compression force that was supporting the pressure spring 38 is released, so the pressure spring 38 rotates the rotation rod 42 downward and moves the front side friction plate 32 rearward. First, contact the front side brake receiving surface 29a of the brake receiver 29, apply a braking force to the propulsion shaft 4 to reduce the rotation from high rotation to low rotation, and then connect the front side friction plate 32 and the brake receiver 29. In the state of contact, the brake receiver 29 is moved rearward and brought into contact with the rear friction plate 34, thereby applying a stronger braking force to the propulsion shaft 4.

Next, the friction plate 32 when assembling these slip prevention devices
．． 34 and the brake receiver 29. First, the play of the main clutch pedal 22 is adjusted using the tongue buckle 25 to an appropriate amount, and then the adjustment bolt 47 is adjusted. Each nut 48,51
Loosen until the adjustment bolt 47 and adjustment plate 49 both slide up and down freely.

In this state, insert the adjustment bolt 47 into the guide plate 44.
When the rotary rod 42 is pushed upward by sliding it upward along the elongated hole 45, there is a position where a load is applied to the rotary rod 42, and this position is where the brake yoke 40 comes into contact with the friction plate 32. , and since both friction plates 32 and 34 are in close contact with the brake receiver 29, the bolt fixing nut 48 is tightened at this point to fix the adjustment bolt 47 to the guide plate 44.

Thereafter, the rotating rod 42 is further pushed upward to its full extent by the adjusting plate 49, and is fixed with the adjusting nut 51.

That is, the adjustment bolts 47 are fixed at appropriate positions, in other words, at a position where each friction plate 32, 34 and the brake receiver 29 are in close contact with each other, and the brake yoke 40 is in contact with the front side friction plate 32. The distance between the front and rear friction plates 32 and 34 is secured to an appropriate amount by the amount by which the adjustment plate 49 is pushed up, thereby adjusting each gap l, 12 to an appropriate amount. When the parts 32 and 34 are worn, it is possible to make adjustments in accordance with the amount of wear by reducing the amount by which the adjustment plate 49 is pushed up.

In summary, the present invention provides one of the clutch disengagement operation parts.
In addition to providing a guide device that moves in conjunction with the disengagement operation of the clutch, the guide device is provided with a guide device that is movable in the direction of movement of the guide device and can be fixed at any position in the direction of movement. A support is attached, and the support is further provided with an adjustment tool that is movable in the direction of movement of the support and can be fixed at any position, and is connected in conjunction with the movement of the brake. The tip of the rotating rod, which rotates in conjunction with the braking device, is supported by the fixing device against the spring, so that by operating the supporting device and the adjusting device, , the gap between each brake device and brake receiver can be easily adjusted.
Therefore, adjustments can be made extremely easily during assembly or when the friction plates are worn.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of the Klatsuchino-Using part showing an embodiment of the present invention, Fig. 2 is an enlarged view of the propulsion shaft braking part in Fig. 1, and Fig. 3 is a cross-sectional view taken along line A-A in Fig. 2. Figure 4 is a front view of the rear friction plate, Figure 5 is a front view of the fixing bolt, Figure 6 is an enlarged view of the vicinity of the main clutch attachment part in Figure 1,
FIG. 7 is also a longitudinal sectional view. 4...Transmission shaft, 8...Main clutch friction plate, 9...Main clutch pressure plate, 22...
・Main clutch pedal, 9... Brake receiver, 32
, 34...Friction plate, 8...Press spring, 42...Rotating rod, 44...Gard plate, 47... Adjustment bolt, 9...
...Adjust Freight.

Claims (1)

[Scope of utility model registration request] A transmission mechanism, such as a tractor, in which a clutch is interposed between a transmission shaft and a drive shaft that drives the transmission shaft, wherein a brake bracket is provided on the transmission shaft, and the transmission mechanism is opposite to the brake bracket, and
A braking device is provided which acts on the braking device to brake the transmission shaft, and this braking device is provided in the braking mechanism for the transmission shaft, which is biased by a spring so as to act on the braking device at all times. A guide that moves in conjunction with the clutch disengagement operation is provided at one location on the clutch disengagement operation section, and the guide includes a guide that moves in the direction of movement of the guide relative to the guide. A support that is movable and can be fixed at any position in the direction of movement is attached to the support, and a support that is movable and fixed at any position in the direction of movement of the support is attached to the support. An adjusting tool that can be fixed in position is provided, and the tip of a rotating rod that is interlocked with the braking tool and rotates in conjunction with the braking tool is supported against the spring by the adjusting tool. Transmission shaft inertia slip prevention device for tractors, etc.