JPH0243049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torque limiter that cuts off the transmission of rotational force when an overload is applied.

Conventionally, torque limiters have an engaging part such as a ball or an inclined cam, and when an overload is applied to the output side, the thrust force acting on the engaging part interrupts power transmission. At this time, the engaging portion repeatedly engages and disengages intermittently, generating strong torsional vibration torque that can damage the power transmission system and cause discomfort to the driver. Furthermore, when the torque limiter operates, it is necessary to disengage the transmission clutch, remove the cause of the abnormal load such as straw clogging, and then engage the transmission clutch again when starting the engine, which is very troublesome work. Furthermore, in many cases, work equipment such as a blade on the output side of a torque limiter is driven, but when working with the torque limiter, an abnormal load is removed without disengaging the transmission clutch, and the work suddenly activates the work equipment, resulting in a serious accident. Occasionally, this occurred.

Therefore, the present invention provides a locking portion on a sliding member that is slid in the axial direction against the urging force by the engaging portion,
Further, a locking member capable of being locked to the locking portion is installed,
Furthermore, when the locking member and the transmission clutch are connected to each other via the interlocking member, when the engaging portion cuts off the power transmission and slides the sliding member, the locking member is locked to the locking portion and the sliding member is held in the position. and holding the locking member,
It is an object of the present invention to provide a torque limiter configured to disengage a transmission clutch by moving an interlocking member, thereby eliminating the above-mentioned drawbacks.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1, 4, and 7, the torque limiter 1 has a case 2, and the case 2 includes a drive shaft 3 connected to the input side,
An output shaft 5 connected to the load side O and an intermediate shaft 6 coaxially with the output shaft 5 are each rotatably supported. A drive gear 7 is fixed to the drive shaft 3, and a driven gear 9, which is always in mesh with the drive gear 7, is rotatably supported on the intermediate shaft 6. Figures 3 and 6 are shown in Figures 3 and 6.
Three half-holes, as shown in Figure and Figure 9 in detail.
9a... is drilled. On the other hand, the intermediate shaft 6 is formed in a hollow shape, and through holes 6b passing through the hollow portion 6a are bored in portions corresponding to the half-holes 9a. These through-holes 6b house poles 10 so as to be able to protrude and engage freely in the half-holes 9a, and one end of the intermediate shaft 6 is configured in a flange shape, and the flange portion 6c has a plurality of poles. Shallow recesses 11 are formed. On the other hand, the output shaft 5 is also configured to have a hollow shape 5a on the side adjacent to the intermediate shaft 6, and overlaps with the end portion of the intermediate shaft 6 so as to be freely rotatably fitted into each other. Furthermore, an inner plate 12 is supported on the output shaft 5 adjacent to the flange portion 6c so as to be non-slidable and non-rotatable by means of splines 5b, etc., and balls 13 are mounted on each of the plates 12.
A plurality of through holes 15 for accommodating... are bored. These balls 13 are normally stored across the through hole 15 and the recess 11, and at this time, the center of gravity of the ball 13 is located in the through hole 15, and the outer peripheral surface is aligned with the other side surface of the inner plate 12. There is. Further, on the other side of the inner plate 12, a lock plate 16 is rotatably supported on the shaft 5 and biased by a plurality of disk springs 17, and furthermore, a lock plate 16 is supported at a predetermined position on the inner circumferential surface of the plate 16. A locking groove 19 having a predetermined depth is formed in the groove. Further, the predetermined position of the output shaft 5, that is, the position where the lock plate 16 is aligned with the concave groove 19 when the torque limiter 1 is activated and slides against the disc spring 17, is shown in FIGS. As shown in detail in FIG. 8, through holes 20 penetrating the hollow portion 5a...
are drilled in these through holes 20, and balls 21 that can protrude and lock into the grooves 19, respectively.
is stored. A lock shaft 22 is fitted across the hollow portions 6a, 5a of the intermediate shaft 6 and the output shaft 5, and the shaft 22 is compressed between the shaft 22 and a collar 23 which is prevented from coming off with a retaining ring. The shaft 22 is biased toward the back by the spring 25, and the shaft 22 has a small diameter portion 22a, a large diameter portion 22b, a small diameter portion 22c, and a large diameter portion 2 in order toward the back.
2d and a small diameter portion 22e, and the boundaries between the small diameter portion and the large diameter portion are respectively sloped portions 22f, and an operating knob 26 is fixed to the outer end of the shaft 22.

Since this embodiment has the above-described configuration, in a normal transmission state in which no abnormal negative fluid is acting on the load side O, the rotation of the drive shaft 3 is controlled by the drive gear, as shown in FIGS. 1 to 3. 7 to the driven gear 9, and is further transmitted to the intermediate shaft 6 based on the fact that the ball 10 riding on the large diameter portion 22b of the lock shaft 22 protrudes and engages with the half-notched hole 9a. has been done. Further, the signal is transmitted to the inner plate 12 via the ball 13 received in the recess 11 of the flange portion 6c of the intermediate shaft 6, and further transmitted to the output shaft 5 via the spline 5b. At this time, the ball 13 is received in the recess 11 and inserted into the through hole 15, and therefore the lock plate 16 is in a position where it is in contact with the side surface of the inner plate 12 by the disk spring 17, and the inner peripheral surface of the lock plate 16 is in contact with the side surface of the inner plate 12. A ball 21 is immersed and held within the through hole 20. In this state, the lockshaft 22 is blocked by the ball 21 and is in a protruding position against the spring 25. Therefore, the ball 10 is located in the large diameter portion 22b, and the driven gear 9 and the intermediate shaft 6 are held in transmission state.

Then, when an overload acts on the load side O, the fourth
As shown in FIG. 6, a force is generated between the intermediate shaft 6 and the inner plate 12, which are transmitting power through the balls 13, to cause relative rotation, and a thrust force based on this force causes the balls 13 to rotate. It escapes from the recess 11 against the biasing force of the disc spring 17, and power transmission between the intermediate shaft 6, the plate 12, and the output shaft 5 is cut off. At the same time, the lock plate 16 is slid by the ball 13 against the disc spring 17, and the groove 19 formed at a predetermined position on the inner circumferential surface of the lock plate 16 slides.
is aligned with the through hole 20 of the shaft. As a result, the fifth
As shown in detail in the figure, the ball 21 is pushed out of the through hole 20 by the slope portion 22f of the lock shaft 22, and the shaft 22 is retracted by the spring 25. In this state, the ball 21 is locked in the groove 19 of the lock plate 16, and the inside thereof is located in the large diameter portion 22d of the shaft 22.
The lock plate 16 is held in the non-engaging position of the ball 13 as shown in FIG. Small diameter part 22
a and enters the through hole 6b of the intermediate shaft 6, and power transmission between the driven gear 9 and the intermediate shaft 6 is interrupted.

When the operator learns that the torque limiter 1 has been activated due to the retraction of the lockshaft 22, the operator removes straw or the like from the working machine such as a knife to eliminate the cause of the overload. At this time, even if the overload on the load side O is removed, the ball 21 still causes the lock plate 16 to remain in the position shown in FIG. Since the clutch is in the disengaged position, power transmission is resumed and the work equipment will not suddenly start moving. Then, after removing the overload, the knob 26
When the shaft 22 is pulled while holding the ball 21, the ball 21 is located in the shaft small diameter portion 22e, the ball 21 is inserted into the through hole 20, and the ball 13 is received in the recess 11 of the intermediate shaft 6, and at the same time the lock plate 16
is moved by the biasing force of the disc spring 17, the torque limiter 1 is reset, and the shaft 22
The ball 10 is caused by the slope portion 22f of the small diameter portion 22a.
The ball 1 runs onto the large diameter portion 22b from the
0 protrudes and engages with the half-notched hole 9a of the driven gear 9,
The transmission clutch is now engaged.

Next, regardless of the operation of torque limiter 1,
When operating only the transmission clutch, as shown in FIGS. 7 to 9, hold the knob 26 and pull the lockshaft 22 fully against the spring 25, and in the pulled state, pull the shaft 22 to the stopper. (not shown) to lock and hold. In this state, the ball 21 is still attached to the shaft 22.
The ball 10 is located in the small diameter portion 22e of the shaft 22 and freely slides on the lock plate 16, but as shown in detail in FIG. Power transmission between the driven gear 9 and the intermediate shaft 6 is interrupted. Furthermore, when the locking and holding of the lockshaft 22 is released from this state, the ball 10 again rides on the large diameter portion 22b of the shaft 22 due to the slope portion 22f, and the ball 10 protrudes and engages in the half-notched hole 9a of the driven gear 9. The engine stops and the transmission clutch is engaged.

Note that in the above embodiment, the torque limiter was activated by receiving thrust force from the ball 13;
It is not limited to balls, but may also be other engaging parts such as inclined cams.The key point is that the engaging part receives a thrust force and interrupts power transmission, and the engaging part slides in the axial direction against the urging force. Any material having a sliding member may be used. Further, the hollow portion 6a of the intermediate shaft 6 and the output shaft 5,
The lock shaft 22 loosely fitted into the shaft 5a locks and holds the lock plate 16, that is, the sliding member, and connects and disconnects the driven gear 9 and the intermediate shaft 6, that is, works in conjunction with the transmission clutch. Other locking/interlocking mechanisms such as a link mechanism that moves in the direction may also be used. Further, the locking/interlocking mechanism such as the lockshaft 22 may be operated at hand via a Bowden wire.

As explained above, according to the present invention, when the torque limiter 1 operates to cut off power transmission,
The sliding member 16 is locked by the locking member 21 and the interlocking member 22.
automatically locks and holds the disc spring 1.
Since the ball 13 and other engaging portions are prevented from returning based on the urging force of the balls 13 and the like, the engaging portions such as the balls 13 are intermittently pushed into the recesses 11.
It is possible to prevent the generation of torsional vibration torque in the power transmission system without repeatedly engaging and disengaging, etc., and at the same time, the transmission clutch 10 is disengaged to cut off the power transmission from the input side I to the intermediate shaft 6. In addition to this, damage to the power transmission system and discomfort to the driver can be prevented, and the engagement portion 1
1, 12, and 13 can be reduced to maintain stable function over a long period of time. In addition, since the locking member of the sliding member and the transmission clutch are interlocked via the interlocking member 22, there is no need to disengage the transmission clutch when removing the cause of an abnormal load. The transmission clutch engages at the same time as 1 is reset, making operation extremely easy and preventing the work equipment from suddenly operating and causing a serious accident while removing an abnormal load. It can be prevented. In addition, the interlock between the locking member of the sliding member and the transmission clutch is controlled by the hollow portion 5 of the output shaft 5 and the intermediate shaft 6.
If the lockshaft 22 is provided with large diameter portions 22b, 22d and small diameter portions 22a, 22c, 22e provided at portions a and 6a, it becomes compact and the structure is extremely simple, and the locking of the sliding member and the transmission clutch are simplified. Since interlocking operation and independent operation of only the transmission clutch are performed by operating the lockshaft in opposite directions, it can be determined at a glance whether torque limiter 1 is operating or only the transmission clutch is disengaged, improving operability. can do.

[Brief explanation of drawings]

The drawings show an embodiment according to the present invention.
The figure is a cross-sectional view showing the power transmission state, Figure 2 is a cross-sectional view along the line in Figure 1, Figure 3 is a cross-sectional view along the line in Figure 1, and Figure 4 is when the torque limiter is activated and power transmission is cut off. 5 is a sectional view taken along the line of FIG. 4, FIG. 6 is a sectional view taken along the line of FIG. Figure 8 is a sectional view taken along the line of Figure 7, and Figure 9 is a cross-sectional view taken along the line of Figure 7.
FIG. 1...Torque limiter, 5...Output shaft, 5a
...Hollow part, 6...Intermediate shaft, 6a...Hollow part, 1
0... Transmission clutch, 11, 12, 13... Engaging portion, 16... Sliding member, 17... Biasing spring (disc spring), 19... Locking portion (concave groove), 21... Lock Member, 22... Interlocking member (lockshaft), 22
a, 22c, 22e...small diameter part, 22b, 22d
...Large diameter section.

Claims (1)

[Scope of Claims] 1. Power is transmitted between the intermediate shaft 6, which transmits power from the input side via the transmission clutch 10, and the output shaft 5, which is connected to the load side O, during normal loads and when overloaded. In the torque limiter, the torque limiter is provided with engaging parts 11, 12, 13 that interrupt power transmission by a thrust force based on the above, and a sliding member 16 that is slid in the axial direction by the engaging parts against the urging force 17. A locking portion 19 is provided on the sliding member 16, a locking member 21 that can be locked on the locking portion is installed, and the locking member 21 and the transmission clutch 10 are interlocked via an interlocking member 22. , the engaging portion 1
1, 12, and 13 cut off the power transmission and the sliding member 1
6, the locking member 21 is engaged with the engaging portion 19 to hold the sliding member 16 and the locking member in this position, and the interlocking member 22 is moved to disengage the transmission clutch 10. Torque limiter configured as follows. 2 The interlocking member 22 has a large diameter portion 22 provided in the hollow portions 6a, 5a of the intermediate shaft 6 and the output shaft 5.
d, 22b and small diameter portions 22e, 22a, 22c.
Torque limiter as described in section.