JPH0352177Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a device for preventing the rotation of a hydraulic independent PTO clutch employed in a tractor transmission.

(Prior Art) Some devices are equipped with a hydraulic clutch as a means for intermittently transmitting power from a driving shaft to a driven shaft.

Such a power transmission device is equipped with a hydraulic clutch disengagement prevention device that prevents the hydraulic clutch body from rotating due to inertia even when the hydraulic clutch is turned off.

As this continuous rotation prevention device, a brake shoe is provided on the outer periphery of the hydraulic clutch body that can freely move toward and away from the hydraulic clutch body.
There is one in which the shuttle is pressed against the body when the clutch is off.

(Problem to be solved by the invention) By the way, in the conventional technology, when the brake shoe is pressed against the clutch body, the brake shoe may hit unevenly, which causes uneven wear and makes it difficult to maintain accurate braking effect over a long period of time. It was impossible to stabilize it over time. Therefore, if the sliding key is fixed, the structure becomes complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hydraulic clutch rotation prevention device that restricts the rotation of the brake shoe pressed against the clutch body and prevents uneven wear of the brake shoe.

(Means for Solving the Problems) The technical means taken by the present invention to achieve the above-mentioned object are characterized by the fact that the drive shaft 5 is connected via the hydraulic clutch 4 provided in the transmission case 14. A switching valve 11 is provided which is connectably connected to the driven shaft 6 and which turns the hydraulic clutch 4 on and off, and when the switching valve 11 is off, the hydraulic clutch 4 is pressed against the body 10 via hydraulic pressure. This is a hydraulic clutch rotation prevention device having a brake shoe 29, the brake shoe 29 being able to freely approach and separate from the outer circumferential surface of the clutch body 10, and the bearing portion 2 on the driven shaft 6 side.
1, and is also provided near brake system 2.
The longitudinal direction of the shoe 9 extends in the circumferential direction of the clutch body 10, and the shoe 29 is supported on the transmission case 10 side via a shoe shaft 28, and the shoe 29 rotates around the shaft 28. A stopper 32 for regulating the transmission case 1 near the bearing portion 21
It is located at the point provided on the 4th side.

(Function) When the switching valve 11 is turned off, the brake shoe 29 is hydraulically advanced to close the clutch body 10.
pressed against.

At this time, even if the shoe 29 attempts to rotate around the shoe shaft 28 due to the inertial force of the body 10, it hits the stopper 32 and further rotation is restricted.

(Embodiment) Referring to FIG. 3, the overall structure of a hydraulic clutch rotation prevention device illustrated as an example of a PTO transmission system for a tractor is conceptually shown.

In FIG. 3, 1 is a hydraulic pump for the PTO clutch, 2 is a hydraulic pump for lifting and lowering the working machine, and 3 is a hydraulic pump for power steering, each of which is driven by an engine not shown.

4 is a hydraulic clutch, which connects and disconnects power from the drive shaft 5 to the driven shaft 6; the clutch plate 7;
Piston 8, return spring 9 and clutch body 1
0, etc., and by making the fluid sent from the hydraulic pump 1 act on the piston 8 through the switching on of the switching valve 11, the clutch plate 7 is moved against the return spring 9.
is pressed to transmit torque, and when the valve 11 is turned off (this state is shown in Fig. 3), the piston 8 is returned by the spring 9, and the clutch is turned off. By pressing the clutch body 10 with a continuous rotation prevention device 13 via the clutch body 12, inertial rotation thereof is prevented.

In addition, in FIG. 3, 11A is the relief valve 1.
1B indicates a spool.

Referring to FIGS. 1 and 2, the hydraulic pressure switch 4
and details of the continuous rotation prevention device 13 are shown.

In FIGS. 1 and 2, the hydraulic clutch 4 is provided within a transmission case 14. As shown in FIGS.

The driving shaft 5 and the driven shaft 6 have opposing shaft ends supported by a spigot part 15, and the spigot part 15
has a bearing 16.

A bowl-shaped clutch plate support 17 is attached to the drive shaft 5 with splines, and the clutch body 1
It is loaded into 0.

The clutch body 10 is fitted onto the driven shaft 6 and mounted by splines, into which the piston 8 is fitted to slide against the return spring 10, and between the clutch plate support 17 and the clutch body 10.
A multi-plate type clutch plate 7 is provided between the two.

The driven shaft 6 has a bearing 19 on the wall 18 of the transmission case 14.
The bearing 19 is built into a bearing boss 20, and these constitute a bearing portion 21.

Further, the clutch body 10 is provided with a cylindrical body 22 on the back surface thereof, which is concentric with the body axis and has a larger diameter than the bearing boss 20. A ball bearing 23 is interposed therebetween, so that the clutch body 10 is rotatable even in this portion and is supported in alignment with the driven shaft 6.

The rotation prevention device 13 is provided on a wall 24 of the transmission case 14 that corresponds to a lateral side surface of the clutch body 10 .

That is, a boss 25 is formed on the wall 24 to protrude toward the clutch body 10, and the inside of the boss 25 serves as a cylinder chamber 26, and a piston 27 is fitted into the cylinder chamber 26.

A shoe shaft 28 is attached to the piston 27, and a brake shoe 29 is fixed to the shaft end of the shoe shaft 28 on the clutch body 10 side, and the brake shoe 29 has its longitudinal direction extending in the circumferential direction of the clutch body 10.

The switching valve 11 is attached to the outer surface of the wall 24 with its valve case 30 closing the cylinder chamber 26 in an oil-tight manner.

A shoe return spring 31 is fitted onto the shoe shaft 28.

Therefore, when the switching valve 11 is turned off, the hydraulic pressure from the pump 1 is sent to the cylinder chamber 26, the piston 27 is advanced against the shuttle return spring 31, and the brake shoe 29 is moved to the clutch body 1.
0 by hydraulic pressure to prevent inertial rotation of the body 10. When the switching valve 11 is turned on, the shutter 29 is returned by the shutter return spring 31.

The brake shaft 28 is not prevented from rotating with respect to the boss 25, and the brake shaft 29 rotates in the first position around the shaft 28 as the clutch body 10 rotates inertia.
It may rotate in the direction of arrow A in the figure, which causes uneven contact.

Therefore, a stopper 32 is provided on the side of the transmission case 14 near the bearing portion 21, and the rotation of the shoe 29 in the direction of arrow A is restricted via the allowable distance S between the brake shoe 29 and the stopper 32.

In addition, in FIG. 1, 33 is a liquid feeding circuit;
4 indicates a lubrication circuit, and 35 indicates a pilot bearing.

Referring to FIG. 4, the aforementioned hydraulic clutch 4
An example of a transmission device incorporating this into a PTO system is shown.

In FIG. 4, 36 is a crankshaft serving as an engine, and a flywheel 37 is attached to it.

38 is a running system propulsion shaft, the front end of which is supported by the crankshaft 36 via a bearing 39, the rear end of which is supported by the rear wall 41 of the flywheel housing 40 via a bearing 42, and the clutch 43 is connected to the engine. are interlocked and connected via.

The flywheel housing 40 is open at its front end, its front end flange is attached to the engine crankcase with bolts not shown in the drawings, and surrounds the flywheel 37 and clutch 43, and the rear wall 41 is reduced through a stepped portion 40B. Transmission case 1
The front end opening of No. 4 is recessed in the front-rear direction and is connected with bolts or the like (not shown).

45 is a hydraulic clutch mechanism for forward rotation, and 46 is a hydraulic clutch mechanism for reverse rotation.Since both mechanisms have the same configuration, one is shown as a representative.
The other one is illustrated with reference numerals added to the common parts.

That is, a clutch shaft 47 is supported by a pair of front and rear bearings 48 and 49, and a clutch body 50 is fitted onto the clutch shaft 47.

However, in this example, the clutch body on the reverse rotation side is rotatable together with the clutch shaft by a spline 51, etc., but the clutch body on the forward rotation side is supported via a needle bearing 52 so as to be relatively rotatable.

The clutch body 50 has an input gear 53, which is engaged with a drive gear 54 attached to the rear end of the traveling system propulsion shaft 38, and in this case, the gear ratio is the same for both forward and reverse rotations.

Reference numeral 55 denotes an output member, which is fitted and supported on the clutch shaft 47 via a needle bearing 56. The output member 55 has a clutch plate support portion 55A and a gear portion 55B, and the clutch plate support portion 5
5A is inserted into the clutch body 50 and actuates the piston 58 against the return spring 57, so that the clutch element 59 can be freely connected and disconnected.

Therefore, as is clear here, a forward rotation hydraulic clutch mechanism and a reverse rotation hydraulic clutch mechanism are built into the front half of the first transmission case on both sides of the traveling system propulsion shaft, in this example, on the upper and lower sides.

Reference numeral 61 denotes a main transmission mechanism of the traveling system, which is illustrated as a constantly engaged four-speed transmission gear structure in this example, and includes a transmission shaft 63 having a modified transmission gear group 62, a transmission subshaft 65 having a transmission gear group 64, Consisting of
A speed change shaft 62 is supported substantially on the axial extension of the propulsion shaft of the traveling system, and a motion gear 44 is fitted and fixed to the front end of the speed change shaft 62. In the end, the gear part 5
5B is directly engaged, and the reversing hydraulic clutch mechanism 4
6, its gear portion 55B is interlocked via an intermediate gear (not shown).

Reference numeral 66 denotes a hydraulic distribution manifold, which feeds and distributes oil to a first oil passage and a second oil passage formed in the axial direction of the clutch shafts 47, 47', respectively, via seal rings. It is attached to the front side of the rear wall of the wheel housing 40 via bolts.

A connecting member 68 having an oil passage 67 inserted into the upper wall of the flywheel housing is connected to this hydraulic pressure distribution manifold 66 in a communicating manner.

69 is a gear case, and the manifold 6
A case cover 73 having a support cylinder part 72 for a clutch release hub 71 is combined with this gear case 69 as a middle case structure. .

Reference numeral 74 denotes a PTO system propulsion shaft, which has a cylindrical shaft structure and is fitted onto the traveling system propulsion shaft via a needle bearing 75, a seal, etc., and a gear case 69.
and supported by the case cover 73 via bearings,
Further, the front end is connected via an arm 76 to a clutch case 77, where the PTO propulsion shaft is directly connected to the engine.

Reference numeral 78 denotes a PTO transmission shaft system, which consists of the clutch shaft 47' and a transmission shaft etc. that are interlocked and connected to the clutch shaft 47' via a hydraulic clutch 4, and the clutch shaft 47' passes through a hydraulic distribution manifold and a gear case. The gear 7 on the propulsion shaft 74
9 and a gear 80 on the clutch shaft 47. The clutch shaft 47' becomes the drive shaft 5. Therefore, in FIG. 4, the rotational power of the engine is transmitted to the traveling system propulsion shaft 38 through the engagement and disengagement of the clutch 43, and thereby the input of the hydraulic clutch mechanism 45 for forward rotation and the hydraulic clutch mechanism 46 for reverse rotation. The side is rotated.

Therefore, when either one of the clutch elements in the clutch mechanisms 45, 46 is connected, the traveling system transmission shaft 63 is rotated in the normal or reverse direction.

On the other hand, in the case of a PTO system, since its propulsion shaft 74 is directly connected to the engine, the gear transmission mechanism 81
The PTO shaft system 58 is independently rotated through the shaft system 58, and is connected and disconnected through the clutch 4 provided in the middle of the shaft system 58.

(Effect of the invention) According to the invention, the brake shaft 29 is
Since rotation about the shaft 8 is restricted by the stopper 32, the shaft 29 is evenly pressed against the clutch body 10, and uneven wear can be prevented.

Therefore, rotation of the hydraulic clutch 4 due to inertia can be accurately prevented over a long period of time.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a sectional view of the main part, Fig. 2 is a plan view of the same, Fig. 3 is a conceptual diagram of the overall configuration, and Fig. 4 is a sectional view showing an example of the use of the invention. be. 4... Hydraulic clutch, 5... Drive oil, 6... Driven shaft, 10... Clutch body, 11... Switching valve, 14... Transmission case, 28... Shuttle shaft, 2
9...Brake shoe, 32...Stopper.

Claims (1)

[Scope of claim for utility model registration] Hydraulic clutch 4 provided in transmission case 14
The driving shaft 5 and the driven shaft 6 are connectably connected to each other via a switching valve 11 which turns on and off the hydraulic clutch 4. When the switching valve 11 is off, the body 10 of the hydraulic clutch 4 This is a device for preventing rotation of a hydraulic clutch, which has a brake shoe 29 that presses the brake shaft 29 via hydraulic pressure.
1, and is also provided near brake system 2.
The longitudinal direction of the shoe 9 extends in the circumferential direction of the clutch body 10, and the shoe 29 is supported on the transmission case 10 side via a shoe shaft 28, and the shoe 29 rotates around the shaft 28. A stopper 32 for regulating the transmission case 1 near the bearing portion 21
A continuous rotation prevention device for a hydraulic clutch, characterized in that it is provided on four sides.