JPH0710925Y2 - Tractor work machine drive force take-out device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a working machine driving force take-out device having a PTO shaft for taking out a driving force of a working machine such as a rotary cultivator in a tractor.

[Prior Art] A live PTO drive mechanism that drives the tractor PTO shaft at a rotation speed that is independent of the vehicle speed and a ground PTO drive mechanism that drives at a rotation speed that is proportional to the vehicle speed are provided. Obtaining rotational drive of the PTO shaft by the drive mechanism has been performed since the sieve.

And, for example, JP-A-48-104224 and JP-A-56-97.
Generally, as disclosed in Japanese Patent Publication No. 128, a live PTO transmission is provided in the drive mechanism of the live PTO system, and the ground PTO drive mechanism is provided with a ground PTO transmission shaft that receives gear transmission from the propeller shaft. It has been configured to transmit gears from the shaft to the PTO shaft.

Among the two publications mentioned above, the one disclosed in JP-A-48-104224 discloses a live PTO transmission including a transmission shaft and a ground PTO transmission shaft.
The clutch gear, which is provided parallel to the O-axis and is slidable only on the PTO shaft, is selectively meshed with the gear on the speed-change shaft and the gear on the ground PTO transmission shaft. The drive mechanism is configured to obtain rotational drive of the PTO shaft. In addition, the one in Japanese Utility Model Laid-Open No. 56-97128 has a live PTO transmission equipped with a PTO shaft as a transmission shaft and a ground on the PTO shaft.
The PTO gear is fixedly installed, and the ground PT is parallel to the PTO axis.
O A gear that is loosely fitted on the transmission shaft and meshed with the ground PTO gear can be selectively coupled to the ground PTO transmission shaft by the clutch hardware provided only on the ground PTO transmission shaft so that it can slide. It constitutes the PTO clutch.

[Problems to be solved by the invention]

Comparing the two publications mentioned above, the actual development of Sho 56-97128
Since the PTO shaft of the publication is used as the transmission shaft of the live PTO transmission, the number of shafts arranged in parallel is unexamined.
It has a smaller and more compact structure than the one disclosed in Japanese Patent Laid-Open No. 104224.

However, JP-A-48-104224 discloses a structure in which the clutch gear on the PTO shaft is selectively meshed with the live PTO gear and the ground PTO gear to obtain rotational drive of the PTO shaft. Therefore, while the situation in which the PTO axis is connected to the live PTO system drive mechanism and the grand PTO drive mechanism at the same time is not revealed, the one in Japanese Utility Model Laid-Open No. 56-97128 is a live PTO drive mechanism.
Under the condition that the PTO shaft is rotationally driven through the transmission, the ground PTO clutch on the ground PTO transmission shaft may be inserted, and the PTO shaft may be connected to the drive system of two systems at the same time, causing damage to the transmission member. For this reason, it is necessary to provide a double-return connection preventing means that makes it impossible to simultaneously connect to the two-system drive mechanism as described above.

Therefore, the present invention is to provide a new working machine drive force take-out device for a tractor, which has a compact structure similar to that disclosed in Japanese Utility Model Laid-Open No. 56-97128 but does not require the above-described double-back connection preventing means. It is what

[Means for solving problems]

Therefore, in the present invention, as shown in the attached drawings, the present invention provides a work machine driving force take-out device for a tractor, in which a drive shaft 23 is rotationally driven by an engine and a hollow transmission shaft 2 loosely fitted on a PTO shaft 3. While the live PTO transmission 1 for speed change transmission is provided, the ground PTO gear 4 is loosely fitted and installed on the PTO shaft 3, and the PTO between the speed change shaft 2 and the ground PTO gear 4 described above.
On the shaft 3, there is provided a switching clutch 5 which selectively connects the transmission shaft 2 and the ground PTO gear 4 to the PTO shaft 3.

[Action]

The switching clutch 5 that selectively connects the live PTO system hollow transmission shaft 2 and the grand PTO system ground PTO gear 4 which are respectively loosely fitted on the PTO shaft 3 to the PTO shaft 3 is a P clutch.
It is not allowed to connect the TO axis 3 to both the live PTO system drive mechanism and the ground PTO system drive mechanism at the same time, thus eliminating the need for the double recovery connection preventing means as described above.

〔Example〕

The figure shows the inside of a rear case 9 that is connected to the rear of the trash case 8 and is connected to the rear.
A propeller shaft 10 which receives a speed change rotation by an unillustrated vehicle speed change device and a drive shaft 11 which is directly driven to rotate by an unillustrated engine are arranged in the mesh case 8 from a rear case 9
It is provided by rushing in. Front and rear support walls 12, 13 are provided upright on the inner surface of the bottom wall of the rear case 9. A propeller shaft 10 having a two-part structure whose rear end is supported by a support wall 12.
The rear end bevel pinion 14 is meshed with the differential ring gear 15, and the driving force is transmitted from the differential to the left and right rear wheels (not shown). PTO shaft 3 has support wall 13 and rear case rear lid 16
It is supported by and extended rearward from the rear case 9.

The drive mechanism of the live PTO system is supported by the support wall 12 and provided on the extension line of the drive shaft 11 such as the clutch driven shaft 18 and the support wall 12.
The live PTO clutch 19 interposed between the drive shaft 11 and the clutch driven shaft 18 on the front side of the intermediate shaft 21 connected to the clutch driven shaft 18 by the shaft joint 20 arranged on the extension line of the clutch driven shaft 18. The intermediate shaft 21 is supported by the support wall 13 and the rear lid 16.
Has a driving shaft 23 connected to the intermediate shaft 21 by a shaft coupling 22 and the live PTO transmission 1 is arranged between the driving shaft 23 and the hollow transmission shaft 2. ing.

This live PTO transmission 1 comprises two transmission gears 25, 26 integrally formed on a drive shaft 23 and two transmission gears 27, 28 loosely fitted on the hollow transmission shaft 2 respectively. Includes a row of variable speed gear trains. Both speed change gears on the speed change shaft 2
A spline collar 29 is fixedly installed between 27 and 28 by spline fitting, and a shifter sleeve 30 is slidably fitted on the spline collar 29 by spline fitting. A shifter sleeve 30 is attached to the bosses of the speed change gears 27 and 28.
Spline claws 27a, 28 that can engage the spline claws on the inner peripheral surface
a is formed. When the shifter sleeve 30 is shifted from the neutral position shown in the figure to the right in the figure to engage the spline pawl 27a to connect the transmission gear 27 to the transmission shaft 2, the transmission shaft 2
Is at the first speed, and when the shift gear 28 is connected to the speed change shaft 2 by engaging the spline claw 28a by shifting leftward in the figure, the speed change shaft 2 is rotationally driven at the second speed speed. It

The drive mechanism of the grand PTO system has a grand PTO transmission shaft 32 which is provided at a lower position in the rear case 9 with the front and rear ends supported by the rear wall and the support wall 13 of the motion case 8. This transmission shaft 32 is a gear at the front end of the rear case 9.
The gears 33, 34 are connected to the propeller shaft 10 by meshing with each other, and are rotationally driven at a rotation speed proportional to the rotation speed of the propeller shaft 10. A gear 35 is fixedly installed directly behind the support wall 13 on the rear end of the grand PTO transmission shaft 32.
35 is meshed with the ground PTO gear 4 loosely fitted to the PTO shaft 3.

The switching clutch 5 includes a hollow transmission shaft 2 and a ground PT.
It has a spline collar 37 fixedly installed by spline fitting on the PTO shaft 3 between the O gears 4. A clutch sleeve 38 is slidably mounted on the spline collar 37 by a spline fitting, and the spline claw 2a used for the spline fitting of the spline collar 29 on the transmission shaft 2 is changed from the end on the switching clutch 5 side. It is formed on the outer peripheral surface of the shaft 2. A spline claw 4a is formed on the boss portion of the ground PTO gear 4, and the spline claw on the inner peripheral surface of the clutch sleeve 28 can mesh with these spline claws 2a, 4a. From the above, the example switching clutch 5 displaces the clutch sleeve 38 from the neutral position shown in the figure to the right and engages the spline pawl 2a to connect the speed change shaft 2 to the PTO shaft 3 and also in the figure. Move to the left to engage the spline claw 4a, and then ground PTO
It is configured to connect the gear 4 to the PTO shaft 3.

The live PTO clutch 19 is constituted by a clutch housing 40 fixedly installed on the clutch driven shaft 18 and a rotary support hardware 41 fixedly installed on the drive shaft 11 so that a plurality of friction elements can be slidably supported. It is composed of multiple friction plates. A hydraulic pump 42 for supplying hydraulic oil to the live PTO clutch 19 is configured as an internal gear type using the drive shaft 11 as a pump shaft, and is mounted on the rear wall surface of the mission case 8 to be installed in the rear case 9. It is installed above the front edge. The oil discharged from the hydraulic pump 42 is guided to a hydraulic oil passage 43 in the clutch driven shaft 18 via a direction switching valve (not shown), and is supplied to a hydraulic chamber behind the piston 44 of the live PTO clutch 19. The annular oil groove 45 forming the rotary portion of the hydraulic oil supply passage is formed on the outer peripheral surface of the clutch driven shaft 18 and is sealed by the inner peripheral surface of the shaft insertion hole of the support wall 12. The drive shaft 11 is provided with a lubricating oil passage 46 for guiding the leak oil of the hydraulic pump 42 to the bearing portion and the clutch friction element portion.

The live PTO clutch 19 is turned off during a gear shift operation of the live PTO transmission 1, and is generally turned off when the PTO shaft 3 is driven by the ground PTO and when the PTO shaft 3 is not driven.

When the transmission clutch 2 is connected to the PTO shaft 3 by the switching clutch 5 by operating the clutch sleeve 38, the PTO speed is set by the live PTO transmission 1 regardless of the vehicle speed.
The shaft is driven by live PTO, and the clutch P5 is switched by operating the clutch sleeve 38.
Is coupled to the PTO shaft 3, the PTO will rotate at a speed proportional to the vehicle speed.
The axis is driven to ground PTO.

[Effect of device]

PTO shaft 3 with transmission shaft 2 of live PTO transmission 1 as an intermediate shaft
According to the present invention, which is loosely installed on the top, the speed change shaft 2 is the PTO shaft 3
Since the PTO shaft is concentrically located on the PTO shaft 3, the PTO shaft is used as the transmission shaft of the live PTO transmission.
A work machine drive force take-out device having a compact structure similar to that disclosed in Japanese Patent Publication No. 6-97128 is provided, and as described above in the section of the action, the transmission shaft 2 of the live PTO system and the ground PTO gear 4 are provided. By means of the switching clutch 5 provided on the PTO shaft 3 so as to be selectively coupled to the PTO shaft 3, the double joint connection preventing means which was required in the above-mentioned publication is not required and the working machine drive The structure of the force extraction device is simplified.

[Brief description of drawings]

FIG. 1 is a partially exploded vertical side view showing a part of a tractor equipped with an embodiment of the present invention. 1 ... Live PTO gearbox, 2 ... Gearshift shaft, 2a ... Spline pawl, 3 ... PTO shaft, 4 ... Grand PTO gear, 4a ... Spline pawl, 5 ... Switching clutch, 10 ... Propeller shaft, 23 ... Driving shaft, 27, 28 ... Speed change gear, 27a, 28a ... Spline claw, 30 ... Shifter sleeve, 32 ... Grand PTO transmission shaft, 33, 34, 35 ... Gear, 38 ... Clutch sleeve.

Claims (1)

[Scope of utility model registration request] 1. A driving shaft 23, which is rotationally driven by an engine,
While the live PTO transmission 1 for transmitting the speed change to and from the hollow transmission shaft 2 loosely fitted on the PTO shaft 3 is provided, the ground PTO gear 4 is loosely fitted and installed on the PTO shaft 3, and 2 and the ground PTO gear 4 on the PTO shaft 3, provided with a switching clutch 5 for selectively coupling the speed-change shaft 2 and the ground PTO gear 4 to the PTO shaft 3 Drive force take-out device.