JPH0746824Y2 - Clutch device for high speed transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a clutch device provided in a high-speed transmission mechanism between an input shaft and an output shaft of a pruning machine or the like.

(B) Conventional Technology In a conventional clutch device in such a high-speed transmission mechanism, a pawl clutch device is interposed and used between an input shaft and an output shaft.

(C) Problems to be Solved by the Invention In the conventional claw clutch device, if this is used as a clutch device between the output shaft driving the chain saw such as a pruning machine and the input shaft, the output shaft will operate at high speed. Because it's spinning
When the clutch is connected, there is a problem in that the engagement between the claw clutches is poor, the engagement and disengagement of the clutch claws are repeated, power transmission cannot be performed smoothly, and abnormal noise occurs.

It is also possible to use a centrifugal clutch device instead of this claw clutch device, but the centrifugal clutch device has a large volume and weight, and its installation place is limited to a place where lubricating oil does not enter, so the pruning clutch device is used. There is a problem that it cannot be installed in a transmission mechanism inside a mission case that drives a machine saw or the like.

Even if the present invention is provided in the high-speed transmission mechanism in the mission case, the power connection can be done smoothly, no abnormal noise is generated, and reliable power transmission can be performed. It can be easily done by increasing or decreasing the speed,
Moreover, it is an object of the present invention to provide a lightweight and compact clutch device.

(D) Means for Solving the Problems In order to achieve the above object, in the clutch device in the high speed transmission mechanism of the present invention, the input shaft (3) and the output shaft (5) are provided in the transmission case (1). In a transmission mechanism in which a clutch (A) is interposed between an input shaft (3) and an output shaft (5), the shafts are supported in parallel on the same shaft in parallel, and the input shaft (3) and the output shaft (5) are connected. ), The first spring clutch (7) is externally fitted over the connecting portions (3a) and (5a), and one end of the first spring clutch (7) is connected to the input shaft (3) side. Of the spring clutch (7) is engaged with the connection part (3a) of the spring clutch (7), and the other end is loosely fitted to the connection part (5a) of the output shaft (5) with a gap (8). An impeller (9) forming a plurality of blades (9a) on the outer periphery at regular intervals on the (5) side.
Is rotatably mounted on the side of the connecting portion (5a) of the output shaft (5),
Due to the rotational resistance of the impeller (9) between the impeller (9) and the first spring clutch (7), the impeller (9) is joined to the connecting portion (5a) to operate, and by this operation, the first spring clutch ( A second spring clutch (10) for engaging an engagement portion (12) with the second shaft clutch (7) and joining the connection portion (5a) on the output shaft (5) side is interposed.

(E) Action The clutch device configured as described above has the input shaft (3)
Is rotating at a low speed, the power of its input shaft (3) is transmitted to the impeller (9) via the first spring clutch (7) and the second spring clutch (10), and Car (9)
The blade (9a) formed on the outer periphery of the blade rotates at low speed,
At first, the lubricating oil (13) in the mission case (1) rotates slowly with stirring to rotate on the output shaft (5) and the power of the input shaft (3) is transmitted to the output shaft (5). However, the clutch (A) is in the disengaged state.

When the input shaft (3) is gradually rotated at high speed, the power of the input shaft (3) is changed to the first spring clutch (7) in the same manner as above.
And the impeller (9) via the second spring clutch (10)
Due to its high speed rotation, the blades (9a) formed on the outer periphery of the impeller (9) gradually rotate rapidly while stirring the lubricating oil (13), but the impeller (9) ,
By rotating at a high speed, the outer peripheral blade (9a) receives the resistance of the lubricating oil (13) strongly, and the impeller (9) has more than the first spring clutch (7) and the second spring clutch (10). A braking action is generated that receives the power of the output shaft (5) and stops it. By this braking action, the second spring clutch (10) first wraps around the outer periphery of the output shaft (5), resulting in the power of the input shaft (3). Is gradually transmitted to the output shaft (5) by winding around the output shaft (5) of the second spring clutch (10).

Then, this second spring clutch (10) is connected to the output shaft (5).
The first spring clutch (7) is wound around the first spring clutch (7) by the load applied to the output shaft (5) and the load applied to the impeller (9) by transmitting the power of the input shaft (3) to the output shaft (5). It will receive the power of and brake, and as a result,
The first spring clutch (7) gradually and strongly wraps around the outer periphery of the connection parts (3a) (5a) of the input shaft (3) and the output shaft (5), and the power of the input shaft (3) is It is gradually transmitted from the first spring clutch (7) to the output shaft (5), and finally, the input shaft (3) and the output shaft (5) are integrally formed by the first spring clutch (7). Tightened and fixed,
The power of the input shaft (3) is transmitted to the output shaft (5) without slip, and the clutch (A) is maintained in the connected state.

When the rotation of the input shaft (3) is decelerated, the resistance from the lubricating oil (13) of the impeller (9) decreases, and as a result, the output of the second clutch spring (10) is opposite to the transmission at the time of the input. The wrapping force around the shaft (5) becomes weaker, and finally the power transmission is cut off, and the tightening of the connection part (5a) of the first spring clutch (7) becomes loose, and the output from the input shaft (3) Power transmission to the shaft (5) is gradually disengaged, and the clutch (A) is disengaged.

(F) Embodiment An embodiment will be described with reference to the drawings. In FIG. 1, a bearing (2) is provided at one end of a mission case (1).
The input shaft (3) is supported via the output shaft (5), and the output shaft (5) is coaxially supported by the input shaft (3) via the bearing (4) on the other side.
Is supported on the input shaft (3) and the output shaft (5),
The large-diameter connecting portions (3a) and (5a) are formed respectively, and the shaft supporting hole (5b) is rotatable through the metal (6) in the shaft supporting hole (3b) formed at the end thereof. It is connected to the.

A first spring clutch (7) is externally mounted on the outer peripheral portion of the connecting portion (3a) of the input shaft (3) and the connecting portion (5a) of the output shaft (5). The first spring clutch (7) has one end engaged (14) with the connecting portion (3a) of the input shaft (3) and crimped to the outer periphery of the connecting portion (3a).
On the connecting portion (5a) side of the output shaft (5), the connecting portion (5
Since a) is formed to have a diameter slightly smaller than that of the connecting portion (3a), a clearance (8) is provided to loosely fit the outer periphery of the connecting portion (5a), and the rotational power of the output shaft (3) is It is configured to be transmitted to the first spring clutch (7).

A stepped portion (5c) having a diameter smaller than that of the connection portion (5a) is formed between the bearing (4) portion of the output shaft (5) and the connection portion (5a), and the stepped portion (5c) is formed. An impeller (9) having a large number of blades (9a) formed on the outer peripheral portion of the mission case (1) that approaches the inner periphery of the mission case (1) is rotatably loosely fitted to the impeller (9).
Between the first spring clutch (7) and
The second spring clutch (10) having a spring constant smaller than the spring constant of the spring clutch (7) of FIG.
It is loosely fitted to the outer periphery with a gap (11), one end of which is engaged (12) with the end of the first spring clutch (7) and the other end of which is an intermediate part of the impeller (9). Is engaged (13) with
The rotational power of the first spring clutch (7) is configured to be transmitted to the impeller (9) via the second spring clutch (10).

Then, the lubricating oil (13) that is normally used is injected and stored in the mission case (1), and the lubricating oil (13) lubricates the metal (6) and the bearings (2) and (4). When the power of the engine (not shown) is transmitted to the input shaft (3) at a low speed, the power of the input shaft (3) is engaged with the connecting portion (3a) of the input shaft (3) at the first position (14). Is transmitted to the impeller (9) via the spring clutch (7) and the second spring clutch (10), and the impeller (10) rotates at a low speed on the output shaft (5) to form a blade on the outer circumference. (9a) rotates while gently stirring the lubricating oil (13), and the input shaft (3)
Power is not transmitted to the output shaft (5) and the clutch (A)
Is in a disconnected state.

When the rotational speed of the engine is gradually increased and the input shaft (3) is gradually rotated at a high speed, the power of the input shaft (3) is changed to the first spring clutch (7) and the second spring clutch ( When the impeller (9) is transmitted to the impeller (9) via 10) and reaches a rotation speed higher than the set value, the vanes (9a) formed on the outer periphery of the impeller (9) rapidly stir the lubricating oil to scrape it up. Then, the impeller (9) receives a resistance to prevent its rotation due to the blade (9a) and the lubricating oil (13), and the rotational power of the first and second spring clutches (7) and (10) is applied. A braking action that prevents it occurs.

By the braking action of the impeller (9), the second spring clutch (10) whose spring constant is set to a small value is output to the output shaft (5).
Gradually wraps around the outer periphery of the connection part (5a) of the rotor, and the rotational power thereof is frictionally transmitted to the output shaft (5). The second spring clutch (10) serves to brake the impeller (9) and the output shaft (9). It receives the load of 5) and strongly wraps around the outer periphery of the connection part (5a),
Due to the relationship that the spring constant of the first spring clutch (10) is set to be small, a slip occurs between the first spring clutch (10) and the connection portion (5a), and a part of the power of the first spring clutch (7) is output to the output shaft ( 5), so that the rotational power of the first spring clutch (7) is transferred to the first spring clutch (1).
0), the impeller (9) and the output shaft (5) receive the load, and a braking action for stopping the rotational power of the first spring clutch (7) is generated. The first spring clutch (7) gradually and strongly wraps around the outer circumferences of the connection parts (3a) (5a) of the input shaft (3) and the output shaft (5), and the power of the input shaft (3) is the first.
Is gradually transmitted from the spring clutch (7) to the output shaft (5), and finally the first spring clutch (7) connects the input shaft (3) and the output shaft (5) to their connecting portions. (3a) (5
The input shaft (3) is clamped and fixed integrally in a)
Is transmitted to the output shaft (5), and the clutch (A) is maintained in the connected state.

When the rotation of the input shaft (3) is decelerated, the resistance from the lubricating oil (13) of the impeller (9) decreases, and as a result, the connection parts (3a) of the first and second spring clutches (7) and (10). Tightening to (5a) is loosened, power transmission from the input shaft (3) to the output shaft (5) is gradually disengaged, and the clutch (a) is disengaged.

As shown in FIGS. 1 and 2, the inner diameter of the mission case (1) corresponding to the blade (9a) formed on the outer circumference of the impeller (9) has a large number of elements that approach the blade (9a). Form the blades (1a) or, as shown in FIG. 3, form the uneven portions (1b) and (9b) on the respective blades (1a) and (9a), and form the uneven portions (1b) and (9b). If they are made to cross each other, the resistance of the lubricating oil (13) to the impeller (9) can be made to act strongly, and the first and second spring clutches (7)
The braking action of (10) can be enhanced.

In the structure shown in FIG. 4, a connecting portion (18a) is formed at an intermediate portion of the output shaft (18), and a connecting portion (19a) having a diameter slightly larger than the connecting portion (18a) is formed at one side thereof. The input gear (19) is rotatably mounted, and the disk body (20) rotatably fitted to the output shaft (18) is mounted on the other side, and the outer periphery of the connection parts (18a) (19a) is mounted. Insert and install the spring clutch (21).

One end of the spring clutch (21) is engaged with and crimped to the connecting portion (19a), and the other end has a gap (2) between the connecting portion (18a).
2) It is made to engage (23) with the disc body (20), and the return spring (24) and the shifter (25) work together on one side of this disc body (20). Sliding clutch body (26) by means of spline engagement (27)
Installed between the clutch body (26) and the output shaft (18),
A centrifugal force regulation stop member (28) is provided. The centrifugal force regulation stop member (28) is fixed to the axial direction of the output shaft (18) and the support body (30) spline-engaged (29). , A plurality of support holes (31) formed on the outer periphery of the support body (30) are vertically movably fitted, and an upper surface thereof has an inclined surface (32) inclined in the direction of the disc body (20). It comprises a restriction piece (33) and an inclined surface (34) formed on the inner periphery of the clutch body (26) and corresponding to the aforementioned inclined surface (32).

Therefore, the clutch body (26) is slid to the right by the action of the return spring (24) and the shifter (25), and the side surface (20) between the clutch body (26) and the disc body (20).
When a) and (26a) are separated from each other, the rotational power of the input gear (19) is transmitted to the disc (20) via the spring clutch (21), and the disc body (20) moves on the output shaft (18). It only idles at and is not transmitted to the output shaft (18),
The clutch (A) is in a disengaged state.

Next, by the action of the return spring (24) and the shifter (25), the clutch body (28) is slid to the left, and its side surface (26a) is pressed against the side surface (20a) of the disk body (20). The rotation of the disk body (20) that has been rotating integrally with the spring clutch (21) is activated, and as a result, the rotation of the spring clutch (21) is restricted, and the connecting portion (18a) of the output shaft (18) is ), The rotational power of the spring clutch (21) is transmitted to the output shaft (18), and the restriction piece (33) is rotated by the high speed rotation of the output shaft (18) above a certain level.
Due to the centrifugal force, it projects outward, and the inclined surface (32) pushes the inclined surface (34) of the clutch body (28) to maintain the clutch body (26) in contact with the disc body (20). The clutch (A) is maintained in the connected state.

When the input gear (19) rotates at a low speed, the output shaft (18) also rotates at a low speed, and as a result, the centrifugal force acting on the restricting piece (33) becomes weak and the clutch due to the inclined surface (32) The pressing force of the body (26) is released, and the clutch body (26)
Slides to the right due to the joint action of the return spring (24) and the return spring (35) hooked on the shifter (25), and the side surface (26a) of the slide body (20a) moves to the side surface (20a) of the disc body (20). ), The disk body (20) is in a free rotation state.

Accordingly, the spring clutch (21), which is strongly wound around the connecting portion (18a) of the output shaft (18) by being braked by the disc body (20), is loosened and a gap (22) is again formed between the spring clutch (21) and the connecting portion (18a). ) Occurs, the power transmission from the input gear (19) to the output shaft (18) is disengaged, and the clutch (A) is disengaged.

In the case of this configuration, when the rotation of the output shaft (18) becomes low speed, the power transmission from the input gear (19) to the output shaft (18) is automatically stopped, so that it also serves as a clutch and a torque limiter. In addition, when power is transmitted from the input gear (19) to the output shaft (18), the restriction piece (33) by centrifugal force forces the clutch body (28) to the disc body (20).
Since the power transmission state is reliably maintained, the slide pressing force of the clutch body (26) to the disc (20) is also assisted by the restricting piece, so that the operation can be performed with a light operating force. It can be done easily by wireless operation.

(G) Effect of the Invention Since the present invention is configured as described above, it has the following effects.

The power transmission to the output shaft (5) can be interrupted by the rotation speed of the input shaft (3), and the power interrupting operation can be performed by a simple operation of increasing or decreasing the rotation of the engine like the centrifugal clutch. Lubricating oil unlike centrifugal clutches (13)
It can be installed in a mission case (1) that has, and even if the input shaft (3) rotates at high speed,
Smooth power connection and disconnection, reliable power transmission, and even compared to centrifugal clutches that are similar in operation, most of the components are close to the shaft and are small parts, so they are lightweight and compact. A simple clutch device is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a clutch device of the present invention, FIG. 2 is a sectional view taken along line XX of FIG. 1, FIG. 3 is a sectional view of a main part of another embodiment, and FIG. 4 is another clutch device. FIG. (1) …… Mission case, (3) …… Input shaft (3a) …… Connecting part, (5) …… Output shaft (5a) …… Connecting part, (7) …… First spring clutch (8) ) …… Gap, (9) …… Impeller (9a) …… Blade, (10) …… Second spring clutch (11) …… Gap

Claims (1)

[Scope of utility model registration request] 1. An input shaft (3) in a mission case (1).
And the output shaft (5) are supported in parallel on the same shaft center,
In a transmission mechanism in which a clutch (A) is interposed between the input shaft (3) and the output shaft (5), between the connecting parts (3a) (5a) of the input shaft (3) and the output shaft (5). The first spring clutch (7) is externally fitted and mounted, and one end of the first spring clutch (7) is engaged and connected to the connecting portion (3a) on the input shaft (3) side, and the other. The end portion is loosely fitted in the connection portion (5a) on the output shaft (5) side with a gap (8), and is fixed to the output shaft (5) side of the spring clutch (7) at a constant distance from the outer circumference. An impeller (9) forming a plurality of blades (9a) is rotatably mounted on the side of the connection portion (5a) of the output shaft (5), and the impeller (9) and the first spring clutch ( 7), it is operated by being joined to the connection part (5a) by the rotation resistance of the impeller (9), and by this operation, the engagement part (12) with the first spring clutch (7) is engaged. On the output shaft (5) side A clutch device in a high-speed transmission mechanism, characterized in that a second spring clutch (10) joined to a connecting portion (5a) is interposed.