JPH0249064Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is a mid-mounted or front-mounted tractor that cuts lawns by suspending a mower, and connects and disconnects power to the PTO shaft.
This invention relates to a configuration that performs braking to prevent co-rotation when the shaft is stopped.

(b) Prior Art Conventionally, a hydraulic clutch is used as a clutch device for a PTO shaft, and a brake for preventing co-rotation is provided on the driven side of the clutch, which is effective as disclosed in Japanese Utility Model Application No. 55-3082.

This conventional example utilizes the hydraulic circuit of a hydraulic clutch, and when the hydraulic clutch is engaged, its high oil pressure releases the brake against the spring, and when the hydraulic clutch is disconnected, the spring performs the braking. It is.

However, using a hydraulic clutch as a clutch device itself requires piping, switching valves, etc., which increases costs, and the anti-corrotation brake device must be fixed in a separate location inside the transmission case, separate from the clutch. Ta.

(c) Problems to be solved by the invention The purpose of the invention is to use a simple mechanism to simultaneously brake the companion brake in conjunction with the engagement and disengagement of the clutch of the PTO shaft. This is intended to prevent the mower from suddenly rotating when it is stopped, resulting in an accident resulting in injury or death, and to ensure the safety of the operator.

In addition, the PTO shaft clutch can be released and the brake applied in one stroke, and the PTO clutch and brake can be released in one stroke.
By integrally configuring the PTO shaft anti-rotation brake, it does not take up space in the front and rear directions of the transmission case, resulting in a compact structure.

(d) Means for solving the problem The purpose of the present invention is as described above. Next, the configuration for achieving the purpose will be explained.

In a PTO clutch device that stops the rotation of a PTO shaft of a tractor, a clutch housing 51 is disposed close to a transmission case, and a clutch housing 51 is disposed close to the transmission case, and there is a gap between the outer periphery of the clutch housing 51 and the transmission case.
A PTO braking plate 46 is interposed, a clutch plate 47 is interposed between the inner periphery of the clutch housing 51 and the clutch drive shaft 12, and the PTO clutch pressing lever 45 straddling the PTO braking plate 46 and the PTO clutch plate 47 is connected to the clutch. supported by the housing 51;
It is configured so that it can simultaneously connect, disconnect, and brake the rotation of the PTO shaft.

Also, in the PTO clutch device, it can be inserted into the clutch driven shaft 14 to release the PTO clutch.
A spring 48 that performs PTO braking is interposed, and the spring 4
8, the PTO clutch pressing lever 45 is pressed.

(e) Embodiments and operations The purpose and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings and the operation of the invention will be explained.

Fig. 1 is a side view of the tractor transmission of the present invention, Fig. 2 is a side cross-sectional view of the traveling drive system of the transmission case, Fig. 3 is a side cross-sectional view of the PTO drive system, and Fig. 4 is the differential gear system. 5 is a side sectional view of the PTO clutch device of the present invention, FIG. 6 is a front view of the clutch housing 51, and FIG. 7 is a side sectional view of another embodiment of the PTO clutch device. Figure 8 is a drawing showing the power transmission system.
FIG. 9 is a drawing showing the operating mechanism of the PTO clutch device.

The overall configuration will be explained with reference to FIG.
The transmission case is the front transmission case 4,
It is composed of a rear transmission case 5,
An HST type transmission A is fixedly installed at the front of the front transmission case 4. Power is transmitted from the engine E to the pump shaft 6 of the HST type transmission A. 2 is the front wheel power take-off shaft, 1 is the rear PTO shaft, and 3 is the mid PTO shaft.

Next, the power transmission system of the traveling drive system will be explained with reference to FIGS. 2 and 4.

The rotation after the gear change is transmitted from the motor shaft 7 of the HST type transmission A to the inside of the front transmission case 4. A fixed gear 19 at the rear end of the motor shaft 7 meshes with a fixed gear 20 on the speed change shaft 8, and other fixed gears 21 and 22 on the speed change shaft 8 are driven. The fixed gears 21, 22 mesh with loosely fitted gears 24, 25 on the pinion shaft 9,
The gears are changed by the back and forth movement of the pinion shaft 9
The rotation is caused by a pinion 9a that engages with a differential ring gear 16 of a differential gear device. The left and right differential rotation is controlled by the differential side gear 29L,
29R, and drives axles 17L and 17R. Disc plates 18L, 18R of a steering brake device are interposed on the axles 17L, 17R. 26 is a differential shifter, 27 is a differential slider, and 28 is a differential pin.

15L and 15R are rear axle housings fixed to the side surfaces of the rear transmission case 5.
Further, a spline is carved on the front end of the pinion shaft 9, and when front wheel drive is required, a gear 30 is fixedly installed on the spline, and the fixed gear 30 is attached to the front wheel power take-off shaft 2. The clutch slider 32 meshes with the fitted gear 31, and the forward and backward movement of the clutch slider 32 connects and disconnects power to the front wheel power take-off shaft 2.

Next, the PTO drive system will be explained using Fig. 3.

The pump shaft 6 directly protrudes from the HST type transmission A, and power is transmitted to the clutch drive shaft 12 by coupling. The clutch drive shaft 12
A PTO clutch plate 47 is interposed between the inner periphery of the clutch housing 51 and the clutch housing 51 fixed to the front end of the clutch driven shaft 14. Also, between the outer periphery of the clutch housing 51 and the front transmission case 4,
A PTO brake plate 46 is interposed.

By moving the PTO slider 44 back and forth, the PTO clutch pressing lever 45 is pushed to engage/disengage the PTO clutch and brake the accompanying rotation.

A fixed gear 33 at the end of the clutch driven shaft 14 meshes with a gear 34 on the counter shaft 13, so that the gear 3
4 transmits rotation to the gear 38 on the PTO switching shaft 11. By moving the switching slider 36 back and forth, it is possible to switch between transmitting power to the loose gear 35 and transmitting power from the fixed gear 53 of the PTO switching shaft 11 to the fixed gear 39 of the rear PTO shaft 1. The loosely fitted gear 35 meshes with a fixed gear 42 on the mid-PTO shaft 3, and drives the mid-PTO shaft 3.

40 is a PTO that operates the PTO slider 44
The clutch lever 41 is a shock absorber that dampens sudden engagement and disengagement of the clutch.

Next, the configuration of the embodiment shown in FIGS. 5 and 6 will be explained.

A locking portion 12a of the PTO clutch plate 47 is provided at the rear end of the clutch drive shaft 12, and a PTO clutch plate 47 is provided on the inner periphery of the clutch housing 51.
A PTO clutch plate 47 is interposed between the clutch plate 47 and the locking portion. Further, a locking portion of the PTO brake plate 46 is provided on the outer periphery of the clutch housing 51, and the locking portion of the PTO brake plate 46 provided on the front transmission case 4 is connected to the locking portion of the PTO brake plate 46.
A PTO brake plate 46 is interposed.

Further, a PTO clutch pressing lever 45 is pivotally supported at three locations on the clutch housing 51 via pivot pins 50. Therefore, the PTO clutch pressing lever 45 itself rotates together with the clutch housing 51.

When the PTO slider 44 pushes the PTO clutch pressing lever 45 to the right against the spring 48, the PTO clutch plate 47 is pressed against the first projection 45a formed on the PTO clutch pressing lever.
The clutch drive shaft 12 and clutch driven shaft 14 are integrated. When the PTO slider 44 retreats to the left, the spring 48 pushes the inner end of the PTO clutch pressing lever 45, and the second protrusion 45b formed at the outer end of the PTO clutch pressing lever 45
By pressing the PTO brake plate 46, the PTO clutch is disengaged and the brake is applied simultaneously.

One end of the spring 48 is stopped at the outer periphery of the clutch driven shaft 14, and the other end is engaged with the inner end of the PTO clutch pressing lever, thereby biasing the PTO clutch in the cutting direction. The PTO slider 44 does not need to rotate together with the clutch driven shaft 14;
Although the pushing body 49 is pushed through the bearing 54, it is configured not to rotate. Pushing body 49
is provided with a protrusion for pushing the PTO clutch pressing lever 45.

The embodiment shown in FIG. 7 has the same basic configuration, but differs in that a pin-shaped sliding body 49 is integrally provided on the PTO slider 44. 8th
The figure shows a state where the PTO slider 44 is used to disconnect and engage the PTO clutch, and simultaneously apply co-rotation braking and release.

Figure 9 shows the operating mechanism for moving the PTO slider 44 of the PTO clutch device back and forth.
Engagement part 55 that fits into the groove of PTO slider 44
A rotation shaft 56 is integrally formed on a shifter arm 55 having a shape, and is supported by the rear transmission case 5. One end of the rotation shaft 56 is projected outside the transmission case 5, and an operating lever 40 is mounted thereon.

When the rotation shaft 56 is rotated by the operation lever 40, the shifter arm 55 swings about the shaft 56 as a fulcrum, and the PTO slider 44 moves back and forth.

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

Firstly, due to the rotation of the clutch when it is disconnected,
There have been cases where the PTO shaft rotated and caused a serious accident due to unexpected rotation of the mower device, but in the case of this invention, by actively applying braking immediately as soon as the PTO clutch is disconnected, this type of accident can be avoided. Accidents can be prevented.

Second, by vertically swinging the PTO clutch press lever, the PTO clutch can be engaged and disconnected and the accompanying brake can be applied in one stroke.
This simplifies the structure of the clutch and brake, reduces the number of parts, and reduces the cost of the PTO clutch device.

Thirdly, by configuring the PTO clutch and the brake device for preventing co-rotation inside and outside the clutch housing 51, it is possible to construct a compact PTO clutch device without taking up space in the front and rear direction. The transmission case also does not need to be large.

[Brief explanation of the drawing]

Fig. 1 is a side view of the tractor transmission of the present invention, Fig. 2 is a side cross-sectional view of the traveling drive system of the transmission case, Fig. 3 is a side cross-sectional view of the PTO drive system, and Fig. 4 is the differential gear system. 5 is a side sectional view of the PTO clutch device of the present invention, FIG. 6 is a front view of the clutch housing 51, and FIG. 7 is a side sectional view of another embodiment of the PTO clutch device. Figure 8 is a drawing showing the power transmission system.
FIG. 9 is a drawing showing the operating mechanism of the PTO clutch device. A...HST type transmission, 1...Rear PTO shaft,
3...Mitsudo PTO shaft, 6...Pump shaft, 12...
...Clutch drive shaft, 14...Clutch driven shaft, 4
5...PTO clutch pressure lever, 46...PTO
Brake plate, 47...PTO clutch plate, 48...spring, 51...clutch housing.

Claims (1)

[Scope of claims for utility model registration] (1) PTO that stops the rotation of the tractor's PTO shaft
In the clutch device, the clutch housing 5
1 is placed close to the transmission case, a PTO brake plate 46 is interposed between the outer periphery of the clutch housing 51 and the transmission case, and a PTO brake plate 46 is interposed between the inner periphery of the clutch housing 51 and the clutch drive shaft 12. A clutch plate 47 is interposed between the PTO brake plate 46 and the PTO clutch plate 47.
A PTO clutch device for a tractor, characterized in that a PTO clutch pressing lever 45 is supported by a clutch housing 51 and is configured to be operable to simultaneously disconnect/engage the rotation of the PTO shaft and brake/release the rotation. (2) PTO as stated in Paragraph 1 of Claims for Utility Model Registration
In the clutch device, a spring 48 is inserted into the clutch driven shaft 14 to release the PTO clutch and perform PTO braking.
A tractor PTO clutch device characterized in that a PTO clutch pressing lever 45 is pressed.