JPH0249065Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is a mid-mounted or rear-mounted tractor that uses a hanging mower to cut the lawn, etc., and connects and disconnects the power from the PTO shaft of the tractor. and,
This relates to a configuration that simultaneously performs braking to prevent co-rotation when the PTO axis 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, 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 a spring, and when the hydraulic clutch is disengaged, the spring performs braking. It is.

However, using a hydraulic clutch as a clutch device itself requires piping, switching valves, etc., resulting in high costs, and the rotation prevention brake had to have a rotating location inside the transmission case. .

(c) Problems to be solved by the invention The purpose of the invention is to simultaneously brake the co-rotation 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 due to rotation, resulting in an accident resulting in injury or death, and to ensure the safety of the operator.

Additionally, the PTO shaft clutch can be released and the brake applied in one stroke of the PTO slider.
Inside the PTO slider that connects and disconnects the PTO clutch.
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.

Of the clutch drive shaft 12 and the clutch driven shaft 14 to which power is connected and disconnected via the PTO clutch device of the tractor, the clutch driven shaft 14 is configured as a cylindrical shaft, and the clutch driven shaft 14 is always attached by a spring 41. By inserting the biased cam bar 63 and pushing the cam bar 63 by the spring 41, the
The PTO clutch device is biased in the connection direction, and the PTO slider 44 is placed between the outer circumference of the clutch driven shaft 14.
With the PTO brake plate 46 interposed, the PTO slider 4
4 is slid against the spring 41 in the direction in which the PTO clutch is disengaged, co-rotation braking is applied.

(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.

Figure 1 is a side view of the tractor transmission of the present invention, Figure 2 is a side sectional view of the transmission drive system of the transmission case, Figure 3 is a side sectional view of the PTO drive system, and Figure 4 is the pinion shaft. Fig. 5 is a plan sectional view of the front wheel power take-off shaft, Fig. 6 is a front view showing the arrangement of each shaft inside the transmission case, and Fig. 7 is the transmission case. The rear view of FIG. 8 shows the main part of this invention.
9 is a sectional side view of the PTO clutch device, FIG. 9 is a rear sectional view of the anti-corrotation brake section, and FIG. 10 is a side view of the cam bar 63.

The overall configuration will be explained with reference to FIG.

The transmission case 5 is composed of a transmission case front lid 4 that closes the front opening and a transmission case upper lid 5a that closes the upper opening. is permanently installed. Power is transmitted to the pump shaft 6 of the HST type transmission A from the engine. 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 travel drive system will be explained with reference to FIGS. 2 and 5.

The rotation after the gear change is transmitted from the motor shaft 7 of the HST type transmission device A to the inside of the transmission case 5. 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 and 22 are loosely fitted gears 24 on the pinion shaft 9,
25, and the speed is changed by the forward and backward movement of the speed change slider 23. The rotation of the pinion shaft 9 is transmitted to the differential ring gear 16 of the differential gear device D by the pinion 9a. Differential gear device D
The left and right differential rotation is transmitted to the axles 17L and 17R. Further, when front wheel drive is required at the front end of the pinion shaft 9, a fixed gear 30 is fixedly installed as shown in FIG. The clutch slider 32 engages with the clutch slider 32 and moves back and forth to connect and disconnect the power to the front wheel power output 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
and a clutch housing 51 fixed to the front end of the clutch driven shaft 14.
is interposed. Further, a PTO brake plate 46 is interposed between the PTO slider 44 and the clutch driven shaft 14.

The cam bar 63 is normally pushed forward by the spring 41 to connect the PTO clutch device. Then, in conjunction with this operation, the entrainment brake device is released from the brake. That is,
The PTO clutch is engaged/disconnected and the accompanying brake is operated at the same time.

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
Gear 3 on the PTO switching shaft 11 is rotated faster than the other fixed gear 62 on the counter shaft 13.
The rotation is transmitted to 8. When the switching slider 36 moves back and forth on the locking portion 38a of the loose-fit gear 38, power is transmitted to the locking portion 35a of the loose-fit gear 35, and when the fixed gear 5 at the rear end of the PTO switching shaft 11
It is possible to switch between transmitting power to the fixed gear 39 of the rear PTO shaft 1 through the locking portion 37 for 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. The PTO switching shaft 11 is connected to the intermediate shaft 61 by a coupling.
A fixed gear 53 is fixed to the rear end of 1.

As described above, in the present invention, the power transmission devices for the PTO system and the travel system are arranged in duplicate in the transmission case 5, and the arrangement of each shaft is configured as shown in FIGS. 7 and 8. There is. That is, rear
The PTO shaft 1 is located at the center of the upper part of the transmission case 5, and the mid PTO shaft 3 is located at the lower pinion shaft 9.
It is arranged on the side opposite to the front wheel power take-off shaft 2. A PTO switching shaft 11 is arranged between the rear PTO shaft 1 and the mid PTO shaft 3.
Switch the PTO power on the PTO switching shaft 11 to
This is transmitted to PTO axis 1 and mid PTO axis 3.

Next, from Fig. 8, Fig. 9, and Fig. 10, the present invention is shown.
Let me explain the configuration of the PTO clutch device.

A clutch drive shaft 12 is connected to the rear end of the pump shaft 6 by a coupling, and a locking portion for a PTO clutch plate 47 is provided at the rear end of the clutch drive shaft 12.
A PTO clutch plate 47 is interposed between the PTO clutch plate 47 and a locking portion of the PTO clutch plate 47 provided on the inner diameter.

An actuator 71 that presses the PTO clutch plate 47 to connect the clutch is installed in the clutch housing 51 alongside the PTO clutch plate 47. The actuator 71 is pressed toward the PTO clutch plate 47 to connect the clutch.

The clutch housing 51 is connected to the clutch driven shaft 14
When the clutch housing 51 is rotated via the PTO clutch plate 47,
The clutch driven shaft 14 is rotated.

The clutch driven shaft 14 is formed into a cylindrical shaft, and the cam bar 63 can be slid within the cylindrical shaft. The cam bar 63 is configured as a pin with a head, as shown in FIG.
The spring 41 is in contact with a. The biasing force of the spring 41 causes the cam bar 63 and the cam pin 64 to
Press to bring the PTO clutch plate 47 into the connected state.

In addition, a PTO brake plate 4 is provided on the front of the head 63a.
The pressure plate 69 of No. 6 is applied.

In this configuration, when the PTO clutch is to be disengaged, the PTO clutch lever 70 is moved toward the locking groove of the guide plate (not shown), and the cam bar 63
is always biased by the spring 41 in the direction of the disengaged state of the PTO clutch, but the left and right shifter pins 67 of the lever arm 40 cause the PTO slider 44 and the PTO braking plate 46 interposed therein to bias the spring 41 in the direction of the disengaged state of the PTO clutch. contracted and pressed toward the pressing plate 69,
An anti-rotation brake is applied between the compressed spring 41 and the compressed spring 41.

Therefore, after the clutch is disengaged, the rotation of the PTO shaft is completely stopped.

The clutch driven shaft 14 is provided with a sliding portion 14a so that the head 63a of the cam bar 63 and the pressing plate 69 can be engaged with each other, and the cam bar 63 and the pressing plate 69 are engaged with the sliding portion 14a. Thus, it rotates together with the clutch driven shaft 14.

When connecting the PTO clutch, remove the clutch lever 70 from the locking groove of the guide plate (not shown), the lever arm 40 will move forward, and the PTO clutch will move forward.
The co-rotating brake device composed of the slider 44 and the PTO brake plate 46 is slid forward, and the brake is released. Further, the head portion 63a of the cam bar 63 is pushed by the spring 41, and the cam bar 63 moves forward, and the cam pin 64 is pushed up by the inclined surface 63b at the front end, thereby connecting the PTO clutch plate 47.

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

First, by actively applying braking immediately upon disengagement of the PTO clutch, it is possible to prevent personal injury caused by unexpected rotation of a working machine connected to the PTO shaft, such as a mower device.

Second, since the PTO clutch and rotation prevention brake are mechanically configured, the cost is low.

Thirdly, the operator can easily operate the PTO because the PTO clutch can be engaged and disconnected and the co-rotating brake can be applied and released in one stroke of the PTO slider 44's forward and backward movement.

Fourth, the configuration of the brake device to prevent co-rotation was
The PTO slider 44, which connects and disconnects the PTO clutch, is used as a fixed member for braking, and the structure is made up of a friction plate placed inside the slider, which allows for a compact structure.

[Brief explanation of the drawing]

Figure 1 is a side view of the tractor transmission of the present invention, Figure 2 is a side sectional view of the transmission drive system of the transmission case, Figure 3 is a side sectional view of the PTO drive system, and Figure 4 is the pinion shaft. Fig. 5 is a plan sectional view of the front wheel power take-off shaft, Fig. 6 is a front view showing the arrangement of each shaft inside the transmission case, and Fig. 7 is the transmission case. The rear view of FIG. 8 shows the main part of this invention.
9 is a sectional side view of the PTO clutch device, FIG. 9 is a rear sectional view of the anti-corrotation brake section, and FIG. 10 is a side view of the cam bar 63. A...HST type transmission, 1...Rear PTO shaft,
3...Mitsudo PTO shaft, 6...Pump shaft, 12...
...Clutch drive shaft, 14...Clutch driven shaft, 4
1... Spring, 44... PTO slider, 45...
...PTO clutch pressing lever, 46...PTO braking plate, 47...PTO clutch plate, 51...clutch housing, 63...cam bar, 69...pressing plate, 70...PTO clutch lever.

Claims (1)

[Scope of utility model registration request] Of the clutch drive shaft 12 and the clutch driven shaft 14 to which power is connected and disconnected via the PTO clutch device of the tractor, the clutch driven shaft 14 is configured as a cylindrical shaft, and the clutch driven shaft 14 is always attached by a spring 41. By inserting the biased cam bar 63 and pushing the cam bar 63 by the spring 41, the
The PTO clutch device is biased in the connection direction, and the PTO slider 44 is placed between the outer circumference of the clutch driven shaft 14.
With the PTO brake plate 46 interposed, the PTO slider 4
4 in the direction of disengagement of the PTO clutch against the spring 41, the PTO slider 44 is brought into pressure contact with the PTO braking plate 46 and rotates along with the clutch driven shaft to apply braking. tractor's PTO clutch device.