JPH022113Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to a power transmission device.

(Prior Art) Conventionally, as shown in FIG. 4, for example, in an agricultural working machine using a power transmission device, a one-way clutch and a slip clutch are built into the flywheel portion a of a haybeler. A one-way clutch and a slip clutch prevent damage caused by rotational force of the flywheel and damage caused by overload when an input shaft is provided and the tractor's PTO shaft is stopped.

On the other hand, in a device that transmits power by passing a belt between a driving pulley and a driven pulley that are fixed to the rotating shaft of a motor, one end of the motor base that supports the motor can be freely rotated around the attached member. A belt tension adjustment device is known, characterized in that the belt tension adjustment device is pivotally attached to the motor base and has a spring tensioned between the other end of the motor base and the attached member to apply a predetermined tension to the belt. Conventional example, 1977-
No. 76881 "Belt tension adjustment device").

(Problems to be Solved by the Invention) Conventional agricultural machinery has had the problem of requiring these one-way clutches and slip clutches.

On the other hand, in the conventional "belt tension adjustment device", the spring is "when the belt 11 is stretched during use and the drive pulley 3 and the driven pulley 10 are loosened, the motor base 4 Because it rotates in the direction of the arrow due to the restoring force of
The distance between the driving rotary body 3 and the driven rotary body 10 is slightly widened, and a constant tension is always applied to the belt 11. ” (Full text of conventional example, p. 4, 16)
line ~ page 5, line 2). That is, in the conventional example, the biasing force of the spring is applied in the direction of the attached member 7 to which the motor base 4 is attached, and the reason is that the purpose is to eliminate slack in the belt. Therefore, even if the conventional "belt tension adjustment device" is used in an agricultural working machine, the spring does not replace the action of a one-way clutch or a slip clutch.

(Means for Solving the Problems) This invention consists of an input rotating body of a working machine driven by a power source, a work drive rotating body having a larger mass than the input rotating body, and an input rotating body and a work drive rotating body. The covering material to be wrapped around the input rotating body, the supporting part whose free end is attached to the input rotating body and is rotatable around a support shaft provided on the opposite end, and the supporting part to be wrapped around the input rotating body. On the object introduction side, when the supply of driving force to the input rotating body is stopped, the spring body is biased with enough force to allow the free end side of the support part to move toward the covered object feeding side of the input rotating body. The conventional problems are solved by providing a power transmission device characterized by the following.

(Function) If the driving force to the input rotating body is stopped during work,
The input rotating body and the work drive rotating body continue to rotate due to inertia, but since the work drive rotating body has a larger mass than the input rotating body, the work drive rotating body tends to rotate further than the input rotating body. do. Then, the input rotary body is driven and pulled by the work drive rotary body through the covered object. Therefore, the input rotating body moves to the feeding side of the covered installation, and the covered installation slides.

(Example) Next, an example of this invention will be described based on the drawings. FIG. 1 is a front view of this embodiment, and FIG. 2 is a sectional view. Reference numeral 1 denotes an input shaft, to which an input rotary body (in this embodiment), an input pulley 2, is firmly fixed, and is pivotally connected to a support portion 4 (in this embodiment, a support plate) so as to be swingable about a support shaft 3. Reference numeral 6 denotes a large-diameter work drive rotating body. In this embodiment, the work drive pulley also serves as a flywheel, and is wrapped around the input pulley 2 on the input side with a belt 5 in this embodiment. . The working drive pulley 6 is pivotally connected to a drive shaft 7, and has a boss 9 fixed to the front part thereof, to which a connecting plate 10 is fixed.
The work drive pulley 6 and the tip of the connecting plate 10 are fastened together with bolts 11.

The support shaft 3 is arranged below the extension line between the center of the input shaft 1 and the drive shaft 7, and the support plate 4 is connected to the spring 12 downward, that is, to the introduction side of the belt 5 sent from the work drive pulley 6 of the input pulley 2. It becomes more energized.

Next, the operation of the embodiment will be explained using a hay baler employing this embodiment. FIG. 3 is a schematic plan view showing power transmission, in which the power of the tractor rotates the input shaft 1 and appropriately biases the support plate 4 by the spring 12, thereby connecting the input pulley 2, the work drive pulley 6, and the belt. A frictional force is generated between the pulleys 5 and 5, and the work drive pulley 6 rotates. The rotation of the work drive pulley 6 rotates the drive shaft 7 via the boss 9 and the connecting plate 10. The rotation of the drive shaft 7 drives a plunger 16 to which an outer fork 17 is fixed integrally via gears 13, 14 and a rotating shaft 15. On the other hand, the power is transmitted to the sprocket 18 via the chain by the sprocket 8, thereby driving the inner fork 19 and the knotter 20. The pick-up section 21 is driven by a pulley 22 connected to a pulley 23 by a suitable belt transmission means.

Through the power transmission as described above, raw materials (grass, rice straw, etc.) are picked up by the pick-up section 21,
The outer fork 17, which reciprocates integrally with the plunger 16, moves the plunger 16 towards the inner fork 19.
is supplied to Next, it is compression-molded by a plunger 16, and then tied by a knotter 20 and discharged to the side.

When there is no overload, that is, during normal work, the frictional force between the input pulley 2 and the belt 5 is greater than the input torque, and the support plate 4 moves to the side where the belt is tensioned, that is, to the belt introduction side of the input pulley 2, that is, downward in the figure. , the belt 5 is tensioned and transmits power.

If an overload is applied during work, the input torque becomes greater than the friction between the belt 5 and the input pulley 2,
The belt 5 slides on the input pulley and does not transmit power to the work drive pulley.

Also, when connected to a tractor with a single clutch type PTO shaft and stopping the PTO shaft,
If a one-way clutch is not installed, the flywheel will continue to rotate due to inertia.
Even if the PTO shaft is stopped, the rotational force of the flywheel becomes a power source to drive the tractor, but in this embodiment, when the rotation of the input pulley 2 stops, the inertia of the work drive pulley 6 on the work machine side causes the belt to 5.
rotates, and the input pulley 6 becomes the driving side. At that time, the input pulley 2 becomes the driven side and is pulled, and the distance between the input shaft 1 and the drive shaft 7 is shortened, that is, the support plate 4 to which the input pulley 2 is pivoted moves upward in the figure (in the rotational direction of the belt 5). and the belt 5 slides (fifth
figure).

Note that the tension of the spring 12 is appropriately set to achieve the above operation.

Therefore, the function of a one-way clutch and a slip clutch is achieved with a simple structure, and since the sliding movement of the belt is utilized, there is no need for accessories such as shear bolts, and there is the practical advantage that it can be manufactured at a low cost.

(Effect of the invention) An input rotating body of a working machine driven by a power source, a working driving rotating body whose mass is larger than the input rotating body, and a covering material wrapped around the input rotating body and the working driving rotating body. an object, a support part whose free end side is attached to the input rotary body and rotatable around a support shaft provided on the opposite end side; When the supply of driving force to the input rotating body is stopped, the free end side of the support part is constituted by a spring body that biases the input rotary body with a biasing force sufficient to move toward the covering material feeding side. Therefore, when the driving force to the input rotating body is stopped during work, the input rotating body and the work driving rotating body continue to rotate due to inertia, but since the working driving rotating body has a larger mass than the input rotating body, The work drive rotating body tends to rotate further than the input rotating body. Then, the input rotary body is driven and pulled by the work drive rotary body through the covered object. Therefore, the input rotating body moves to the feeding side of the covered installation, and the covered installation slides.

Therefore, although it has a simple structure, it achieves the functions of a one-way clutch and a slip clutch.

[Brief explanation of the drawing]

Fig. 1 is a front view of the embodiment of the present invention, Fig. 2 is a sectional view thereof, Fig. 3 is a schematic plan view showing power transmission, Fig. 4 is a perspective view showing a conventional flywheel section, FIG. 5 is a diagram showing a state in which the belt spins idly. 2... Input rotating body, 4... Supporting part, 5... Covered object, 6... Work drive rotating body, 12... Spring body.

Claims (1)

[Scope of utility model registration request] An input rotating body of a working machine driven by a power source, a working driving rotating body whose mass is larger than that of the input rotating body, a covering material wrapped around the input rotating body and the working driving rotating body, and a free end. A supporting part that is attached to the input rotating body on one side and rotatable around a support shaft provided on the opposite end, and a supporting part that is attached to the input rotating body on the introduction side of the covering equipment, and the driving force to the input rotating body is attached to the input rotating body. 1. A power transmission device comprising a spring body that biases the free end side of the support portion with a biasing force sufficient to move the input rotary body toward the covering material feeding side when the supply of the support portion is stopped.