JPH0318746Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a shaft support device for a hydraulic clutch type transmission shaft system used, for example, in a tractor PTO system transmission shaft system.

(Prior art) For example, there is a transmission device that incorporates a hydraulic clutch as a tractor PTO system, and the clutch is turned ON and OFF by operating a switching valve to transmit torque from the driving shaft to the driven shaft, and the clutch is turned OFF. In some cases, there are devices designed to prevent this continuous rotation.

That is, as shown in FIG. 4, a hydraulic clutch 1 is composed of a clutch body 2, a clutch plate 3, a piston 4, a return spring 5, etc., and connects and disconnects a driving shaft 6 and a driven shaft 7.

8 is a switching valve, which has a relief valve 10 and a spool 11 in the valve body 9;
When hydraulic pressure from 2 acts on the piston 4 through the oil passage 13, the clutch is engaged, and when no hydraulic pressure acts, the clutch is off.

When the clutch is off as shown, hydraulic pressure is applied to the piston 16 of the anti-rotation device 15 through the oil passage 14, and the brake shoe 17 is pressed against the clutch body 2 against the return spring 18.

(Problems to be solved by the invention) By the way, the hydraulic clutch 1 shown in FIG.
Although the driving shaft 6 and the driven shaft 7 are rotatably supported in the transmission case by bearings, center runout may occur due to intermittent rotation of the clutch body 2.

In particular, the brake shoe 17 of the continuous rotation prevention device 15
When the clutch body 2 is pressed against the clutch body 2, shaft deflection is likely to occur along with center runout, and the body 2
This not only causes uneven wear of the shoe 17, but also makes it impossible to ensure accurate transmission.

This invention provides a shaft support device that prevents shaft deflection and core runout by mutually supporting the opposing shaft ends of the driving shaft and driven shaft and supporting them with large capacity bearings on the clutch body side. The purpose is to

(Means for Solving the Problems) A feature of the technical means taken by the present invention to achieve the above-mentioned object is that the driving shaft and the driven shaft are aligned with each other and placed inside the transmission case. In a hydraulic clutch that is supported by a bearing through a bearing and can freely connect and disconnect the driving shaft and the driven shaft, a cylindrical boss 31 formed on the body 26 of the hydraulic clutch 21 is connected to the driving shaft 22 or the driven shaft. The cylindrical boss 31 is fitted onto one of the shafts 23, and the outer peripheral surface of the cylindrical boss 31 is supported by a bearing hole 41 formed in the transmission case 20, and a cylindrical body 45 is formed in the body 26 concentrically with the bearing hole 41. The cylindrical body 45 and the bearing boss 42 having the bearing hole 41 are supported via a bearing 46, and the opposing shaft ends of the driving shaft 22 and the driven shaft 23 are relatively rotatable via the spigot part 37. The point is that it is supported by

(Embodiment) In FIG. 1, reference numeral 20 denotes a transmission case serving as a tractor body, in which a hydraulic clutch 21 is built.

Reference numeral 22 denotes a driving shaft, which is supported by the transmission case 20 via a bearing (not shown), and is connected to an engine (not shown).

23 is a driven shaft, and the wall 24 of the transmission case 20
The driving shaft 22 and the driven shaft 23 are inserted into and supported by a bearing 25, and the axes of the driving shaft 22 and the driven shaft 23 are aligned with each other.

The hydraulic clutch 21 includes a clutch body 26 and a cylinder chamber 27 formed inside the body 26.
and a piston 28 fitted into the cylinder chamber 27.
, a clutch plate mounting body 29, a clutch plate 30, etc., and in this example, a cylindrical boss 31 formed in the center of the clutch body 26 in the axial direction is fitted onto the driven shaft 23 and fixed by a spline 31. The clutch plate mounting body 29 is fixed to the driving shaft 22 by a spline 33 and inserted into the cylinder chamber 27 of the clutch body 26.

It should be noted that a configuration opposite to that shown in the drawings, in which the clutch body 26 is attached to the driving shaft 20 and the clutch plate mounting body 29 is attached to the driven shaft 23, may be used.

The clutch plate mounting body 29 and the cylindrical boss 31 are supported by a pilot bearing 34 so as to be relatively rotatable, and the bearing 34 has a spring receiver 35.
A return spring 36 is provided between the spring receiver 35 and the piston 28 so as to surround the cylindrical boss 31.

37 is a spigot part, in which a protruding shaft 38 formed in an axially protruding shape at the shaft end of the drive shaft 22 connects to the driven shaft 23.
A bearing 40, indicated by a bush, is interposed between the outer periphery of the protruding shaft 38 and the inner periphery of the recess 39.

The cylindrical boss 31 of the clutch body 26 is inserted into a bearing hole 41 formed in the wall 24, and the bearing hole 41 is formed in a bearing boss 42 protruding from the wall 24.

The clutch body 26 has a bowl shape with one side open, and includes a bottom wall 43 that projects radially outward from the axial middle of the cylinder boss 31, and a circumferential wall 44 that extends in one axial direction from the outer peripheral end of the bottom wall 43. and the bottom wall 4
3 is formed with a cylindrical body 45 that is concentric with the bearing hole 41, and the cylindrical body 45 surrounds a bearing boss 42. A bearing 46 is fitted between both 45 and 42, and here, It has a centripetal or centripetal configuration.

Additionally, in FIG. 1, reference numeral 47 denotes a piston operating oil passage, which is formed in the cylinder boss 31 in the axial direction and communicates with the cylinder chamber 27.

Reference numeral 48 denotes a lubricating oil passage, which is formed at the axis of the driven shaft 23 and communicates with the oil passage 49 in the radial direction toward the clutch plate 30.
It is plugged with. Note that this plug 50 may not be provided, and in this case, the bearing 40 will be lubricated.

51 is a driving system transmission shaft, and 52 is a front wheel propulsion shaft.

The driving shaft 22 and the driven shaft 23 constitute the transmission shaft system of the PTO system, and the rear of the driven shaft 23 is
It has a PTO transmission section.

Referring to FIG. 2, the side wall 5 of the transmission case 20
4 is equipped with a continuous rotation prevention device 55.

The prevention device 55 includes a cylindrical portion 57 having a cylinder chamber 56 formed in a side wall 54, a piston shaft 59 having a piston 58 fitted in the chamber 56, a brake shaft 60 attached to an end surface of the piston shaft 59, and Consisting of a piston return spring 61, etc.
A brake shoe 60 can freely approach and separate from the outer peripheral surface of the clutch body 26.

62 is a switching valve device, and its valve case covers the cylinder chamber 56.

The configuration of the switching valve device 62 is the same as that of the switching valve shown in FIG. At this time, hydraulic pressure is applied to the cylinder chamber 56 to release the spring 6.
1, the shutter 60 is activated.

FIG. 3 shows a pair of left and right rotation prevention devices 54 connected to each other by an oil passage 63. By symmetrically providing the left and right pairs of the devices 54, the clutch body 26 can be pressed equally on the left and right sides.

Note that the operation of the interlock prevention device 54 when the clutch 21 is turned on and off in this embodiment is the same as the structure explained in FIG. At this point, torque is not transmitted, and inertial rotation of the clutch body 26 is prevented by the contact of the shoe 60.

(Effect of the invention) The present invention has a driving shaft and a driven shaft that are supported in a transmission case through bearings with their axes aligned with each other, and a hydraulic system that allows the driving shaft and driven shaft to be freely connected and disconnected. In the clutch equipped with the clutch, a cylindrical boss 31 formed on the body 26 of the hydraulic clutch 21 is fitted onto either the driving shaft 22 or the driven shaft 23, and the outer peripheral surface of the cylindrical boss 31 is formed on the transmission case 20. A cylindrical body 45 is formed on the body 26 concentrically with the bearing hole 41, and the cylindrical body 45 and a bearing boss 42 having the bearing hole 41 are supported via the bearing 46. Furthermore, since the opposing shaft ends of the driving shaft 22 and the driven shaft 23 are supported through the spigot part 37 so as to be relatively rotatable, there are the following advantages.

The clutch body 26 not only has its cylindrical boss 31 supported by the bearing hole 41, but also has a cylindrical body 45 concentric with the bearing hole 41 supported via the bearing 46, so that the bearing capacity is large and stable. Therefore, the clutch body 26 can be prevented from wobbling.

In addition, since the opposing shaft ends of the parking shaft 22 and the driven shaft 23 are supported through the spigot part 37 so as to be relatively rotatable, there is no axial runout of the shafts 22 and 23, and from this point of view, Stable and accurate torque can be transmitted.

Therefore, even if the structure is such that the shuttle 60 is pressed against the clutch body 26 to prevent inertial slipping, the body 2
6 and the shoe 60 can be prevented from uneven wear.

[Brief explanation of drawings]

FIG. 1 is a longitudinal side view of the embodiment of the present invention, FIG. 2 is a longitudinal rear view showing only a part thereof, FIG. 3 is another longitudinal rear view, and FIG. 4 is a conceptual diagram of a conventional example. 20...Transmission case, 21...Hydraulic clutch,
22... Driving shaft, 23... Driven shaft, 31... Cylinder boss, 41... Bearing hole, 37... Pilot part, 45
... Cylinder, 46 ... Bearing.

Claims (1)

[Claims for Utility Model Registration] A driving shaft and a driven shaft are supported in a transmission case via bearings with their axes aligned with each other, and a hydraulic pressure system is provided that allows the driving shaft and the driven shaft to be freely connected and disconnected. In the clutch equipped with the clutch, a cylindrical boss 31 formed on the body 26 of the hydraulic clutch 21 is fitted onto either the driving shaft 22 or the driven shaft 23, and the outer peripheral surface of the cylindrical boss 31 is formed on the transmission case 20. A cylindrical body 45 is formed on the body 26 concentrically with the bearing hole 41, and the cylindrical body 45 and a bearing boss 42 having the bearing hole 41 are supported via the bearing 46. A shaft support device for a hydraulic clutch type power transmission shaft system, further characterized in that opposing shaft ends of the driving shaft 22 and the driven shaft 23 are supported via a spigot part 37 so as to be relatively rotatable.