JPS6256013B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a front
Regarding PTO equipment.

Previously, large tractors with 50 horsepower or more were not equipped with a PTO device at the front of the machine, but recently, PTO devices have been installed at the front of the machine for use in cleaning operations such as dairy farming, or snow removal work. The one with the shaft attached appears.

As for something similar to this, for example,
There is one described in Publication No. 116525. In this device, a PTO device equipped with an electromagnetic clutch is attached to a mounting frame provided at the front of the agricultural tractor.

With such a PTO device equipped with an electromagnetic clutch, the operation part on the main body side and the electromagnetic clutch are simply connected by electrical wiring, so there are advantages such as no need for a link mechanism. This poses a problem, especially in humid areas, where wiring parts become corroded, leading to more failures and lower operating rates.

The present invention has been made in view of the above problems, and is directed to a front PTO system in which a front PTO shaft is disposed protruding from a gear case wall in which a power transmission mechanism from a prime mover is housed. A PTO input shaft 8 is provided with a gear 10 that meshes with the gear 6 constituting the power transmission mechanism, and a PTO input shaft 8 is provided between the PTO input shaft 8 and the PTO shaft 18 for engaging and disengaging the power between the two. First PTO shaft device 74 with mechanical clutch mechanism A
and a PTO input shaft 61 equipped with a gear 65 that meshes with the gear 6 that also constitutes the power transmission mechanism, and a PTO input shaft 61 and a PTO shaft 66 for engaging and disengaging the power between them. A second PTO shaft device 75 equipped with an electromagnetic clutch mechanism B can be selectively attached to the gear case 1.

Hereinafter, the structure of the present invention will be explained based on an illustrated embodiment. In FIG. 1, reference numeral 1 denotes a gear case that constitutes a part of the tractor body, and inside this gear case 1 is a prime mover, that is, Transmission shaft 2 that transmits power from the engine to the PTO shaft (described later),
3, and large and small gears 4, 5, and 6. Reference numeral 7 denotes a front gear case lid that covers the front end opening 1a of the gear case 1, and the front gear case lid 7 includes a first insulator according to the present invention.
A PTO input shaft 8 constituting a PTO shaft device 74 is arranged to penetrate inside and outside. The middle of this PTO input shaft 8 is connected to a bearing 9 by the front gear case lid 7.
A gear 10 attached to the inner end of the PTO input shaft 8 is connected to the gear 6 in the gear case 1.
It's engaged. The inner end of the PTO input shaft 8 is supported by a protruding wall 7a extending inward from the front gear case lid 7 via a bearing 29.
As a result, the PTO input shaft 8 and the front gear case lid 7 are integrated. In this embodiment, the PTO input shaft 8, the front gear case lid 7, and the gear 10 attached to the inner end of the PTO input shaft 8 are integrated into the gear case 1.
When installed, the PTO input shaft 8 and gear 10 are inserted through the opening 1a of the gear case 1, and the gear 10 is engaged with the gear 6 on the gear case 1 side, and then the front gear case The lid 7 is attached to the gear case 1 with bolts 30, and the PTO that is attached in this way
On the outside of the front gear case lid 7 of the input shaft 8 are a front PTO shaft 18 and a front PTO shaft 1.
A mechanical clutch mechanism A for engaging and disengaging the power to 8 is pre-equipped integrally.

Therefore, to explain the structure of part A of this mechanical clutch mechanism, reference numeral 11 is a clutch case consisting of a bowl-shaped clutch case body 12 and a clutch case lid 13 that covers an opening on the rear side of the clutch case body 12. , the clutch case 11 is fitted onto the outer end of the PTO input shaft 8 protruding from the front gear case lid 7 so as to cover the end of the PTO input shaft 8, and the front side of the clutch case 11 is It is directly supported at the end of the PTO input shaft 8 via a bearing 14, and on the other rear side, the cylindrical boss 15 of the clutch case lid 13 is externally supported by a bearing 16 to a bearing ring 17 fitted onto the PTO input shaft 8. It is fitted and rotatably supported. Further, a flange 18a of a front PTO shaft 18 is fixed to the front side surface of the clutch case 11 with a bolt 19, so that the front PTO shaft 18 and the clutch case 11 are configured to rotate together. PTO covered by clutch case 11
A friction plate hub 21 is externally fitted onto the end of the input shaft 8 via a spline 20, and the outer circumference of the friction plate hub 21 and the inner circumferential surface of the clutch case body 12 opposite to the outer circumference of the friction plate hub 21. To transmit power from the friction plate hub 21 to the clutch case 11,
In addition, a multi-plate clutch plate 2 interrupts this power transmission.
2 and 23 are arranged alternately. Furthermore,
Similarly, in the clutch case 11, a donut-shaped push ring 2 is located at the rear of the friction plate hub 21.
4 is externally fitted onto the clutch input shaft 8 so as to be slidable in the front-back direction and rotatable. 25 is a release bar whose one end is fixed to the push ring 24, and the other end of this release bar 25 extends forward in parallel with the PTO input shaft 8 through the friction plate hub 21, and has a front end. Similarly, a donut-shaped clutch release plate 26 is attached, and the rear side of this clutch release plate 26 is connected to the multi-plate clutch plate 22,
It is facing 23. Reference numeral 27 denotes a pressure contact spring, which is inserted into the friction plate hub 21 by inserting a bottomed cylindrical spring receiver case 28 and disposed between the bottom of the spring receiver case 28 and the front side surface of the push ring 24.
As a result, the push ring 24 is always urged to slide rearward, and the clutch release plate 26 presses against the multi-plate friction plates 22 and 23, thereby transmitting power from the friction plate hub 21 to the clutch case 11. In addition, the pressure contact spring 27
When the push ring 24 is slid forward against the force of
This clutch release plate 26 moves forward,
Both multi-plate friction plates 22 and 23 are released from pressure and the clutch is closed.

Therefore, the disengaging operation of this clutch, that is,
To explain the structure of the clutch cutting device for sliding the push ring 24 forward, first, 31 is a donut-shaped rotary boss portion 32 and a rotary boss portion 32 that integrally projects in the radial outward direction from the outer periphery of the rotary boss portion 32. Arm 33
This cam lever 31 has a rotary boss portion 32 interposed in the gap between the clutch case 11 and the front gear case lid 7 of the gear case 1, and also has a rotary boss portion 32 interposed in the gap between the clutch case 11 and the front gear case lid 7 of the gear case 1. It is fitted externally to the PTO input shaft 8 so as to be rotatable and slidable in the axial direction by means of a bearing 34 fitted inside. Further, an annular groove 35 is formed on the front side surface of the rotary boss portion 32.
The end portion of the cylindrical boss 15 of the clutch case lid 13 that protrudes rearward overlaps within the cylindrical boss 5 . Note that 36 indicates a spacer interposed between the bearing 34 and the PTO input shaft 8, and a sliding plate 37 is slidably attached to the spacer 36 on the front side of the bearing 34. This sliding plate 3
7 and the push ring 2 in the clutch case 11
4 is blocked by the support shaft ring 17, and as shown in FIG.
8 is formed, and a sliding key 39 inserted into the guide groove 38 is interposed between the push ring 24 and the sliding plate 38. Next, an annular protrusion 40 centered on the eight PTO input shafts is formed on the rear side of the rotating boss 32, and this annular protrusion 40 is formed in an annular recess formed on the front side of the gear case lid 7. 41 so as to be rotatable and slidable. Furthermore, conical support grooves 42 are formed at a plurality of locations in the circumferential direction at the bottom of the annular recess 41 on the side of the gear case lid 7, and cam balls 43 are inserted into the conical support grooves 42. Furthermore, as shown in FIG. 2, a cam groove 44 is formed in the rear side of the annular protrusion 40 of the rotary boss 32, and both circumferential walls thereof are formed with inclined surfaces 47. The inclined surfaces 47, 47 of are in contact with the cam ball 43.

45 is the rotary boss portion 3 as shown in FIG.
As shown in FIG. 3, one end of a brake band 48 as a braking device is fixed to the front end of a support bolt 46, which is a projection formed at one location on the outer periphery of the brake pad 45 and inserted into this projection 45 from behind. The brake band 48 extends in the circumferential direction along the outer peripheral surface of the cylindrical boss 15 of the clutch case lid 13. 49 is a brake support plate whose rear end is fixed to the front side of the front gear case lid 7 by a bolt 50, and the front end extending axially forward from the front gear case lid 7 is provided with the brake band. The other end of 48 is attached,
When the cam lever 31 is rotated to the right in FIG. 3, the protrusion 45 of the rotary boss portion 32 pulls the brake band 48 in the circumferential direction, and the brake liner 51 fixed to the inner surface of the brake band 48 is pulled.
is pressed against the outer peripheral surface of the cylindrical boss portion 15 of the clutch case lid 13 as a braking receiving surface, thereby braking the clutch case 11 and, in turn, the PTO shaft 18.

Now, to explain the action when the clutch is disengaged based on the above configuration, first, the cam lever 31 is
When the rotating boss portion 32 is rotated to the right in the figure, that is, to the front in FIG.
The cam groove 44 on the rear side faces the cam ball 43,
As a result, the inclined surface of the cam groove 44 rides on the cam ball 43, so that the annular protrusion 40 slides inside the annular recess 41 of the front gear case lid 7. , slide forward. Due to this sliding, the rotating boss portion 32 also causes the inner bearing 34 to slide forward.
The sliding plate 37 pushed by the bearing 34 moves the push ring 24 forward via the sliding pin 39,
As a result, as described above, the clutch release plate 2
6 moves forward to disengage the clutch. Further, when the cam lever 31 is rotated in the original direction, the push ring 24 is slid in the original direction by the force of the pressure contact spring 27, thereby reconnecting the clutch. Furthermore, when such a clutch operation is performed, the brake band 48 is pulled in the circumferential direction based on the rotation of the cam lever 31 as described above, so that the brake liner 51 is pulled against the cylindrical boss of the clutch case lid 13. 15 is pressed against the outer peripheral surface of the clutch case 11, that is, the PTO shaft 1
8, its rotation is stopped immediately upon disengagement of the clutch, and idling due to inertia is prevented.

Note that 52 is a lower case lid attached to the lower opening of the gear case 1.

Figure 4 shows the mechanical clutch mechanism A in Figure 1 above.
In place of the first PTO shaft device 74 equipped with, a second PTO shaft device 75 equipped with an electromagnetic clutch mechanism B is used.
This figure shows the case where the gear case 1 is attached to the same gear case 1 as shown in FIG. In this FIG. 4, 61 is a PTO input shaft corresponding to the PTO input shaft 8 of FIG. 1, and similarly to the above-mentioned FIG.
1, a front gear case lid 62 corresponding to the front gear case lid 7 of FIG. 1, and a projecting wall 62a extending inward from the front gear case lid 62.
is supported via bearings 63 and 64, and
A gear 65 corresponding to the gear 10 in FIG. 1 is attached to the PTO input shaft 61.
meshes with the gear 6 in the gear case 1,
Also in this embodiment, these PTO input shafts 61,
and front gear case lid 62 and gear 6
5 is integrally attached to and detached from the gear case 1, and an electromagnetic clutch mechanism and a PTO shaft 66 are integrated in advance on the outside of the front gear case lid 62 of this PTO input shaft 61. There is. Therefore, to roughly explain the structure of this electromagnetic clutch part, a cylindrical clutch shaft 67 is connected to a spline 68 at the outer end of the PTO input shaft 61.
is externally fitted through the clutch shaft 6.
7 and the PTO input shaft 61 are attached to rotate together. 69 is a retaining bolt inserted from the outside of the clutch shaft 67 in a direction perpendicular to the axial direction of the clutch shaft 67 through the groove 61a on the outer circumference of the PTO input shaft 61; PTO input shaft 6 of clutch shaft 67
This prevents it from going beyond 1. clutch shaft 67
A clutch case 71 is fitted onto the outer end of the clutch case 71 via bearings 70, 70, and an electromagnetic clutch mechanism 72 is disposed between the clutch case 71 and the clutch shaft 67, whereby the PTO input shaft 61 and The clutch shaft 67 rotates integrally with the clutch case 71, and is configured to engage and disengage the power from the clutch shaft 67.
A flange 66a formed on the PTO shaft 66 as in FIG. 1 is fixed to the clutch case 71 with bolts 73 so that it rotates together with the clutch case 71.

In the above, the front gear case lid 62 in FIG. 4 is different from the one in FIG. The hole positions of the bolts 30, etc. are all the same as in Fig. 1, so in Fig. 4, the PTO input shaft 61, front gear case lid 6
2. A second PTO shaft device 75 in which the gear 65, the electromagnetic clutch mechanism B and the PTO shaft 66 are integrated;
In FIG. 1, the first PTO shaft device 74 in which the PTO input shaft 8, front gear case lid 7, gear 10, mechanical clutch mechanism A, and PTO shaft 18 are integrated is the same gear case 1. On the other hand, it is designed to be able to be selectively installed at will. That is, the PTO shaft device 7 equipped with the electromagnetic clutch mechanism B
5, when installed on a tractor without a cabin, there was a problem that the wiring part corroded and caused many failures, especially in humid areas, as mentioned above. , equipped with a mechanical clutch mechanism A that is free from corrosion.
By replacing it with the PTO shaft device 74, it can be used without trouble even in humid areas.

As described above, the present invention provides a PTO input shaft including a gear that meshes with a gear constituting a power transmission mechanism built in a gear case, and a PTO input shaft and a PTO input shaft.
A first PTO shaft device, which is located between the shaft and the first PTO shaft device and is equipped with a mechanical clutch mechanism for engaging and disengaging the power between the two, and a PTO shaft device that is equipped with a gear that meshes with the gear that also constitutes the power transmission mechanism. Input shaft and its PTO
A second clutch is located between the input shaft and the PTO shaft and is equipped with an electromagnetic clutch mechanism for engaging and disengaging the power between the two.
By configuring the PTO shaft device to be selectively attachable to the gear case, tractors with a cabin can be equipped with a second PTO shaft device equipped with an electromagnetic clutch mechanism that simplifies the operation system. While manufacturing costs can be kept low, tractors without a cabin can be equipped with a first PTO shaft device with a mechanical clutch mechanism, which can be used in humid areas, improving operating efficiency. This has the effect of being able to.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the device of the present invention equipped with a mechanical clutch device, FIG. 2 is a cross-sectional view of the main part of the cam ball section taken along the circumferential direction, and FIG. FIG. 4 is a longitudinal sectional view of the device of the present invention equipped with an electromagnetic clutch. 1... Gear case, 7, 62... Gear case lid,
8, 61...PTO input shaft, 18, 66...Front
PTO axis, 74...first PTO axis device, 75...second
PTO shaft device, A...mechanical clutch mechanism, B...
Electromagnetic clutch mechanism.

Claims (1)

[Claims] 1 In a front PTO device in which a front PTO shaft is disposed protruding from the wall of a gear case that houses a power transmission mechanism from a prime mover, a gear 10 meshing with a gear 6 constituting the power transmission mechanism built in the gear case 1 is installed. A PTO input shaft 8 provided with the PTO input shaft 8 and between the PTO input shaft 8 and the PTO shaft 18,
A first PTO shaft device 74 equipped with a mechanical clutch mechanism A for engaging and disengaging power between the two, a PTO input shaft 61 equipped with a gear 65 that meshes with the gear 6 that also constitutes a power transmission mechanism; A second PTO shaft device 75, which is located between the PTO input shaft 61 and the PTO shaft 66 and is equipped with an electromagnetic clutch mechanism B for engaging and disengaging the power between the two, is selectively attached to the gear case 1. A front PTO device for an agricultural tractor, characterized in that it is configured to enable