JPS5839252B2 - Kuratsuchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides for a driven rotary body to be freely engaged with and detached from the driving rotary body by moving toward and away from the driving rotary body in the direction of the rotation axis, and
A ring-shaped movable cam body that is biased in the direction of engagement is interposed between both rotating bodies and is rotatable around the axis, and the movable cam body is prevented from rotating around the axis. A locking tool that can be manually operated for fixing is provided on the device fixing part, and a wave-shaped cam is provided on the opposing part of the movable cam body and the driving rotary body or the driven rotary body, and the movable cam body and the driving rotary body are Alternatively, the present invention relates to an improvement in a clutch configured to separate the drive rotor and the driven rotor from each other by rotating the driven rotor relative to each other.

This type of clutch has the characteristic that it can smoothly and reliably engage/disengage the clutch as desired using a weak operating force by using the driving force of the drive rotor, but it uses a wave-shaped cam to engage/disengage the clutch. Therefore, if the driven rotor rotates due to overrun or the like when the clutch is disengaged, there is a risk that the corrugated cams may become engaged again. It is necessary to maintain it by means other than the separating action by the wave-shaped cam.

As a solution in view of the above request, a member is provided that maintains the detached state of both rotating bodies by bringing the peaks of the corrugated cams into contact with each other and displacing them in a direction perpendicular to the axis. is possible, but in this case, the holding member is
Unless the waveform cams are configured to exhibit the required action with extremely accurate positions relative to the final position of the separation action, the waveform cams will slightly engage the ridges with each other depending on the operating state of the holding member. There is a possibility that a situation may occur, and the above-mentioned problem may not be reliably resolved.

For this reason, in conventional buttons, a means has been taken to separate both rotating bodies further apart than in the detached state using a wave-shaped cam, through a cam mechanism using an inclined surface, etc., by displacement perpendicular to the axis of the holding member. was considered, but in this case,
There is a problem in that a large operating force is required for displacement perpendicular to the axis of the holding member, and there is a risk that smooth operation may be difficult.

The present invention has been made in consideration of the above-mentioned circumstances, and includes:
In the above-mentioned clutch, the driving rotor and the driven rotor are in a slight engagement state when the ridges of the wave-shaped cam are brought into contact with each other, and the tilted cam forcibly separates the driven rotor from the slight engagement. A holding member is configured as an engaging portion through a surface and engages and maintains the detached state of both rotating bodies that have been forcibly detached at the engaging portion by moving in a direction perpendicular to the axis. It is characterized by

In other words, the large separating action of the driven rotary body from the normal driving rotary body is achieved by using a wave-shaped cam, and by pressing a button in this separated state, the engagement portion between the driving rotary body and the driven rotary body via the inclined cam surface is Furthermore, since the driven rotor is separated further apart than the separating action of the wave-shaped cam, and held in this state by the holding member that is displaced in a direction perpendicular to the axis, the holding member is simply engaged. To obtain a clutch which can perform the clutch disengagement operation and maintain the clutch disengaged state smoothly and easily, since it is orthogonally displaced and does not require a large operating force for this displacement. reached.

Embodiments of the present invention will be described in detail below based on illustrative drawings.

The figure shows a steering clutch installed inside the transmission case of a power tiller, in which the ends of opposing axles 1 and 2 are butt-fitted, and power is applied to this fitted part via a chain. A drive rotating body 3 to be transmitted is pivotally supported.

At the top of the axles 1 and 2, springs 4a and 4b are installed.
The driven rotor is biased toward the drive rotor 3 and configured to constantly engage protrusions 5a and 5b protruding from the drive rotor 3 with a communication hole 6 formed in the drive rotor 3. body 7,8
are spline-connected so as to be slidably displaceable in the axis X direction,
The clutch is configured to be in a clutch engaged state when the driven rotary bodies 7, 8 and the drive rotary body 3 are engaged with each other, and the clutch is configured as described below to change the clutch engaged state to a forced disengaged state. ing.

The 1.2 parts of the left and right axles are constructed in the same way, and the 1 part of the right axle in which the clutch is disengaged will be described below.

That is, between the drive rotor 3 and the driven rotor 1, the driven rotor 7 is in sliding contact with the side surface of the drive rotor 3 and is regulated to a constant position in the axis X direction with respect to the drive rotor 3.
A ring-shaped movable cam body 9 is provided so as to be rotatable around the axis X while being fitted onto the outside of the ring. A cam mechanism 10 is constituted by a waveform cam 10a formed on the body 7 and a waveform cam 10b formed on the movable cam body 9.

As shown in FIG. 2, the movable cam body 9 is rotated by the pivoting engagement of the locking tools 12 that are disposed opposite to the locking holes 11 formed along the outer periphery of the movable cam body 9. Due to the rotation relative to the driven rotary body 7 due to the rotation of the surroundings being prevented, the driven rotary body 7 is forced to move away from the drive rotary body 3 through the cam mechanism 10 against the retaining force. configured to migrate.

The locking device 12 is connected to the transmission case and is manually operated via a connecting device such as a wire by gripping a grip lever provided near the operating handle of the tiller.

The driven rotary body 3 is configured to be capable of forward and reverse rotation via a transmission mechanism in the upper part of the transmission case, and the communication hole 6 formed in the drive rotary body 3 is closed. As shown in FIG. 3A, three holes are formed for forward rotation, three for twisted and three for reverse rotation, and an inclined hole is formed at the lower side in the circumferential direction of each hole 6. Side a
... and b... are formed (see the opening in Figure 3).

Also, the state in which the crests of the waveform cams 10a and 10b butt together (
(See Fig. 4 A and Fig. 5), the engagement portion between the protrusion 5a of the driven rotary body I and the communication hole 6 of the drive rotary body 3 is configured to be in a slight interlocking state. When this slight engagement state is reached, the protrusion 5a of the driven rotating body 7 is forcibly disengaged via the inclined surface a... or b..., and the clutch is thereby disengaged. (See Figure 4 Entrance and Figure 5 Entrance).

Further, the tip 12' of the locking tool 12 is configured to be displaced in a direction perpendicular to the axis X by subsequent rocking, and to be operated to protrude from the locking hole 11 of the movable cam body 9. The clutch is configured as a member that engages with a circumferential groove formed along the outer periphery of the driven rotary body 7 when the clutch is turned to the disengaged state, and maintains the disengaged state of both the rotary bodies 3 and 7. There is.

In addition, at the inclined surface a formed in the communication hole 6 formed in the drive rotary body 3 and at the location opposite to a in the rotational circumferential direction, as shown in FIG. As shown, there are long and gentle slopes a' and b' on the upper side in the rotational circumferential direction.
. . . are formed to facilitate the insertion of the protrusion 5a into the communication hole 6 when the clutch is changed from the disengaged state to the engaged state again.

In the embodiment, the waveform cams 10a and 10b were provided between the driven rotary body 7 and the movable cam body 9, but the waveform cams 10a and 10b were provided between the drive rotary body 3 and the movable cam body 9, as in the embodiment. Waveform cam 1
0a and 10b may be provided to implement a clutch.

Further, in the embodiment of the present invention, the driving rotary body 3 is rotated forward and backward,
Inclined surface a for forward rotation and inclined surface b for reverse rotation...
However, when the pivot body 3 rotates only in the normal direction, the communication hole 6 has an inclined surface a...
・It is only necessary to set up and implement it.

Moreover, this slope a... can be similarly implemented even if it is provided on the protrusion 5a side as shown in FIG. 6A.

In this case as well, as shown in FIG. 6A, it is of course advantageous to provide a sloped surface a' to make it easier to engage the clutch and press the button.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the clutch according to the present invention, and FIG. 1 is a longitudinal sectional front view showing the steering clutch in the transmission case, FIG. Figure 3A is a side view of the drive sprocket, Figure 3A is a cross-sectional view of the Rollo line shown in Figure 3A, Figure 4A is a longitudinal sectional front view showing the operating state of the clutch, and Figure 5A is a front view showing the operating state of the clutch. FIG. 6A is a cross-sectional plan view showing the operating state of the retaining portion, and FIG. 3... Drive rotating body, 7... Driven rotating body, 9... Movable cam body, 10a, 10b...
...Wave cam, 12'...Holding member, a...
...Slope surface.

Claims (1)

[Scope of Claims] 1. The driven rotary body 7 is positioned relative to the driving rotary body 3 at the rotation axis X.
can be freely engaged and detached by moving toward and away from the direction, and
A ring-shaped movable cam body 9 is provided between both rotating bodies 3.7, which is biased in the direction of engagement, and is rotatable around the axis X. A manually operable locking device 12 for fixing rotation around X
is provided in the fixed part of the device, and the movable cam body 9 and the drive rotary body 3 are connected to each other.
Alternatively, a wave-shaped cam 10b is provided at the portion facing the driven rotating body 7. 10a is provided to connect the movable cam body 9 and the drive rotary body 3.
Alternatively, by rotating the driven rotary body 7 relative to each other, the wave-shaped cam 10a,
10b, the driving rotary body 3 and the driven rotary body 7 are in a slightly engaged state, and the slightly engaged part is forcibly separated from the driven rotary body 7 via the inclined cam surface a. A holding member 12' is provided in the holding part and holds and holds the detached state of both rotating bodies 3 and 7 which have been forcibly removed in this holding part by moving in a direction perpendicular to the axis X. A clutch characterized by: