JPH0544580Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a friction clutch structure suitable for use as a turning brake for small mobile agricultural machines such as rice transplanters and tillers.

[Conventional technology]

In general, multi-disc friction clutches in tractors, rice transplanters, and other mobile agricultural machinery are used for running drive between the engine and transmission, or for intermittent power supply such as on output shafts for working machines. It is also used as a steering brake to brake the inner wheels of the vehicle when the agricultural machine changes direction. This type of friction clutch has a claw protruding in the axial direction from the periphery of a large-diameter pressure receiving plate fixed to one shaft, supporting a pressure plate inside the claw, and sandwiching the friction plate between them. was.

[The problem that the idea aims to solve]

As a result, the overall diameter is large and the length in the axial direction is large, making it difficult to secure a space for mounting the operating element of the friction clutch. In addition, in order to eliminate such problems, an attempt was made to make the pressing plate constituting the friction clutch conical (Utility Application No. 62-037746), but when the clutch was disengaged, the conical top of the pressing plate was When the central portion of the friction plate is pressed, the pressing plate itself becomes inclined with respect to the axis of the drive shaft, resulting in problems such as uneven contact with the friction plate and difficulty in uniformly pressing the entire surface of the friction plate.

[Means to solve the problem]

The purpose of this invention is to eliminate such manufacturing defects, to obtain a small-sized friction clutch with a simple structure, and to provide a conical pressure plate that does not fall down. A clutch box 6 is formed by a claw piece 4 protruding from the periphery in the axial direction and a pressing plate 5 that is locked to the claw piece 4, and a friction plate is provided between the pressure receiving plate 3 and the pressing plate 5. 6 is interposed on the drive shaft 2 so as to be movable only in the axial direction,
The pressing plate 5 is formed into a substantially conical shape by press working of a steel plate, with a flange-shaped pressing part 7a that engages with the pressure receiving plate 3, and a conical part 7b that tapers outward in the axial direction from the flange-shaped pressing part 7a. The operating member 11 connected to the operator is engaged with the end forming the periphery of the shaft hole 7d opened at the tip of the portion 7b, and a gap is formed between the pressure receiving plate 3 and the pressing plate 5. The present invention is characterized by the provision of a gap setting means 14 that makes the gap constant.

[Effect]

The operating force transmitted from the actuating member 11 acts on the periphery of the shaft hole 7d constituting the small diameter side of the pressing plate 5, which is formed into a substantially conical shape, and is transmitted from there to the pressing part 7a to sandwich the friction plate 6. Press. In addition, the operating member 1
1 is installed using the space outside the small diameter side of the press plate 5. Further, the pressing plate 5 is connected to the gap adjusting means 14.
This limits the distance from the pressure receiving plate 3 and prevents it from falling over.

〔Example〕

This invention will be explained below with reference to the illustrated embodiment. In the figure, reference numeral 1 indicates the main part of the diverting brake. 2
is a drive shaft braked by the turning brake 1. The drive shaft 2 passes through the center of the turning brake 1 and is connected at one end to an engine (not shown) via a differential gear mechanism, and at the other end to a driving wheel (not shown).

The turning brake 1 is provided in a part of a drive case 1a that houses a differential gear mechanism, and includes a pressure receiving plate 3, two pins 4 as claws protruding from the periphery of the pressure plate 3 in the axial direction, and the claws. A clutch box 6 is formed with a pressing plate 5 which is axially movably engaged with the clutch 4. A friction plate 7 is interposed between the pressure receiving plate 3 and the pressing plate 5 forming the clutch box 6, and the friction plate 7 is arranged only in the axial direction on the outer involute spline 2a formed on a part of the drive shaft 2. movably locked.

The pressing plate 5 is manufactured by press-forming a steel plate, and includes a flange-shaped pressing plate 5a, a conical part 5b tapering in the axial direction from the conical part 5b, a cylindrical part 5c formed at the tip thereof, and a cylindrical part 5c. Fold the tip back and
A shaft hole 5d is integrally molded in the folded portion, and the pressing plate 5 is formed by forming a shaft hole 5d on the outer periphery of the pressing portion 5a.
The two pins 4 are engaged with and supported by the notches 5e at several locations.

Reference numeral 9 denotes an operating cylinder for actuating a dog clutch (not shown) interposed between the engine and the drive shaft 2, and is urged to the left in the figure by a coil spring 10.

Reference numeral 11 connects the actuating cylinder 9 and the pressing plate 5 with a coil spring 10.
It is an actuating arm for moving to the right against the
As shown in FIG. 2, it is connected to a support shaft 12 which has a fork-like shape and is rotatably supported by the drive case 1a. In FIG. 1, the operating arm 11 is shown with a solid line in the upper half of the shaft when the turning brake 1 is applied, and with a chain double-dashed line in the lower half when it is released. A connecting arm 13 is fixed on the support shaft 12, and connects the operating arm 11 to a manual turning operation lever (not shown) via an operation wire (not shown). Note that in FIG. 2, the symbol A indicates the length of the actuating arm 11 to the end of the cylindrical portion 5c, that is, the radius of rotation, and B indicates the distance between the axes of the drive shaft 2 and the support shaft 12. C indicates the effective length of the connecting arm 13. Therefore, when the actuating arm 11 rotates by a certain angle, the amount of movement of the actuating cylinder 9 and the amount of movement of the pressing plate 5 are the ratio of the distances A and B, and the amount of movement of the actuating cylinder 9 is larger. In other words, the operations of the dog clutch, which requires a large movement for engagement and disengagement, and the friction clutch, which requires a small amount of movement, are matched. Reference numeral 14 shown in FIG. 3 is provided between the pressure receiving plate 3 and the pressing plate 5. The gap setting means 14 is used to adjust the gap between them to be constant at each position on the circumferential surface, and to avoid uneven contact of the friction plates 7. That is, the pin 15 welded to the pressure receiving plate 3 loosely passes through the pressing portion 5a of the pressing plate 5, and a one-way clip 16 is fitted to the outside of the pressing portion 5a. One-way clip 16
As is conventionally known, it consists of a substantially annular thin steel plate and a plurality of claws 17 projecting inward from the steel plate.
After setting the gap between the pressure receiving plate 3 and the pressing plate 5 to a predetermined constant amount, if the pin 15 is press-fitted, the claw portion 17 changes from the free state shown by the two-dot chain line to the deflection shown by the solid line in FIG. It deforms into a bent state and strongly frictionally engages with the pin 15 to prevent the pressing plate 5 from retreating and maintain a constant distance from the pressure receiving plate 3.

Since this embodiment is constructed as described above, when the turning handle is operated to turn the direction of travel of the agricultural machine, the turning brake 1 on the side to be turned is activated.
The actuating arm 11 swings to the position shown by the solid line in FIG.

Therefore, the actuating arm 11 rotates from the position shown by the two-dot chain line to the position shown by the solid line, and its tip moves the actuating cylinder 9 significantly to the right in the figure, and the engine (not shown) connected thereto The engagement of the dog clutch between the drive shaft 2 and the drive shaft 2 is disengaged, and the power to the drive shaft 2 is cut off, resulting in the agricultural machine being coasted.

The actuating arm 11 simultaneously presses the end of the cylindrical portion 5c near the base end, moves the pressing plate 5 forward by a relatively small amount, and operates the steering brake 1. Therefore, the rotation of the drive shaft 2 is stopped and the agricultural machine is turned to the side of the stopped brake.

[Effect of idea]

As described above, in the friction clutch structure of the mobile agricultural machine according to this invention, of the pressure receiving plate 3 and the pressing plate 5 forming the clutch box 6, the latter has a substantially conical shape whose outer diameter decreases from the pressure receiving plate 3 toward the other side. This provides a relatively large space outside the small diameter portion for arranging the operating element (actuating arm 11 in the embodiment) and other parts of the friction clutch. In addition, the pressing plate 5
is formed by pressing a steel plate, and the pressure receiving plate 3
a flange-shaped pressing portion 5a that engages with the flange-like pressing portion 5a; a conical portion 5b that tapers outward in the axial direction from the pressing portion 5a;
Since the shaft hole 5d is provided at the tip of the shaft hole 5d, a highly rigid pressed portion with which the actuating arm 11 is engaged can be obtained at its small end. Further, the pressing plate 5 is made in a conical shape, and the end face of the small diameter part is connected to the operating arm 1.
1, the gap with the pressure receiving plate 3 is maintained constant by the gap setting means 14, and the radial component force generated by the rotation of the actuating arm 11 is kept constant by the gap setting means 14. Even if this happens, it has the effect of preventing you from falling down.

Note that the conical portion 5b does not necessarily have to be a geometrically accurate cone, and may be formed in a stepped shape as necessary. Although described above, this invention is of course not limited to this, but can also be applied to a power friction clutch interposed between a prime mover and a transmission.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; Fig. 1 is a cross-sectional view showing the main part of the turning brake, Fig. 2 is a cross-sectional view thereof, Fig. 3 is an enlarged sectional view of that part, and Fig. 4 is a cross-sectional view of that part. - It is a cross-sectional view. 3... Annular pressure receiving plate, 5... Pressing plate, 5a...
Flange-shaped pressing part, 5b...conical part, 5c...cylindrical part, 5d...shaft hole, 6...clutch box, 7...friction plate.

Claims (1)

[Scope of utility model registration request] A clutch box 6 is formed by the pressure receiving plate 3, a claw piece 4 protruding from its periphery in the axial direction, and a pressing plate 5 that is locked to the claw piece 4. A flange-shaped pressing portion 5 in which a friction plate 7 is interposed so as to be movable only in the axial direction on the drive shaft 2, and the pressing plate 5 is engaged with the pressure receiving plate 3 by press working of a steel plate.
a and a conical portion 5b that tapers outward in the axial direction from the conical portion 5b. A friction clutch structure for a mobile agricultural machine, which is provided with a gap setting means 14 which engages an operating member 11 and maintains a constant gap between the pressure receiving plate 3 and the pressing plate 5.