JPH0349309Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a ball clutch structure for a pulley for power transmission.

(B) Prior Art Conventionally, a torque limiter is constructed by providing a ball clutch mechanism inside a power transmission pulley, as shown in, for example, Japanese Utility Model Application Publication No. 50-53548.

In the above-mentioned conventional type, a ball clutch mechanism is constructed by supporting a pulley on the main shaft and providing a ball, a ball holding part, and a clutch sliding body between these. The clutch mechanism is configured to be turned on and off by means of a clutch hawk that protrudes from the upper part of the clutch housing.

(c) Problems to be solved by the invention However, in the above-mentioned ball clutch mechanism, the structure of the operation part for operating the ball clutch mechanism on and off is complicated and large.
When installed in a power working machine such as a combine harvester, the power transmission device becomes large and has problems such as not only the power transmission device cannot be smoothly turned on and off.

Furthermore, in the conventional method, the operating state of the ball clutch mechanism cannot be quickly confirmed, which results in multiple troubles and makes it impossible to work efficiently.

(d) Means for solving the problem Therefore, in the present invention, a locking ball as a ball clutch mechanism is provided between the power transmission pulley and the input shaft, and a locking ball that engages with the ball and connects the input shaft from the pulley. A ball holder that transmits power is interposed on the side, and the ball holder is slidably attached so that the ball holder can disengage from the ball when an overload is applied to the input shaft side. In addition to being configured to be removable, the input shaft and ball holder are configured to stop when the ball holder slides and the ball clutch is disconnected. , a sensor seat which also serves as a return seat for restoring the holder to the clutch connected state is connected via a cam engagement part and a reverse spring, and an alarm sensor is provided on the outside of the sensor seat, It is an object of the present invention to provide a ball clutch structure for a pulley for power transmission, which is constructed so that an alarm sensor is activated by a sensor seat that slides when the ball clutch is disengaged.

(E) Effect The clutch is connected, that is, the state in which power can be transmitted between the power transmission pulley and the input shaft is when the locking ball is engaged with the ball holder, and in this state, there is no excessive force on the input shaft. When a load is applied, the ball holder is disengaged from the ball and is slid into a clutch disengaged state. At this time, the end of the ball holder that has been slid is By engaging the sensor seat and activating the alarm sensor, the operator is notified of the clutch disengagement state, and the operator can quickly
Moreover, by taking appropriate measures, it is possible to continue the necessary work without any major errors.

Moreover, since the sensor seat also serves as a return seat for restoring the clutch disengaged state to the clutch connected state, restoring work can be performed via the sensor seat.

(f) Effects According to the present invention, a sensor seat is provided at the end of the ball holder on the shaft center side, and the sensor seat also serves as a return seat for restoring the ball holder to the clutch-connected state. By contributing to the return seat for restoring the clutch connection and the sensing when the clutch is disengaged, the structure is simple and compact as a whole, and the alarm function can be maintained, and the restoration work can be done quickly. This is easy to do, and has the effect of improving the durability of the machine as well as improving work efficiency.

Since the alarm sensor is operated by a non-rotating sensor seat, the sensor will not be damaged.

Furthermore, the sensor seat activates a warning sensor to notify the operator of the clutch disengagement state, and the operator can take prompt and appropriate measures.

Therefore, it is possible to prevent unexpected troubles and perform various tasks efficiently.

(G) Example The example of the present invention will be explained in detail based on the drawings.
A indicates a combine harvester, and this combine A
The reaping section 1 is arranged on the front side of the combine main body a, and the crawler running section 2 is arranged on the lower side, and a threshing section 3 and a wind sorting section 4 are arranged on the upper and lower sides of the front left side of the combine main body a, respectively. The straw disposal section 5 is stored and arranged at the rear, and the driving section 7 is arranged at the front right side, and the crawler running section 2
While traveling in the field by the drive of 5 and discharged to the outside of the combine main body a.

The waste straw processing unit 5 houses a tying machine (not shown) for tying the waste straw, and a pulley 8 for power transmission is connected to the tip of an input shaft 6 of the tying machine. A power transmission belt 10 is suspended from the engine 9 and supported by the pulley 8 via a predetermined interlocking mechanism, so that the power of the engine 9 can be input to the binding machine from the input shaft 6.

Moreover, between the input shaft 6 and the pulley 8,
Locking ball 1 as a ball clutch mechanism
5, and a ball holder 12 that engages with the ball 15 and transmits power between the input shaft 6 and the pulley 8.
A ball clutch structure is constructed in which the locking ball 15 disengages from the ball holder 12 in response to an overload on the input shaft 6, thereby cutting off power transmission. Same holder 12
A sensor seat 18 is connected to the axial end of the sensor S, and a sensor S is interlocked with the sensor seat 18.
Accordingly, the operator seated in the driving section 7 can be alerted to the disconnected state of the ball clutch via a lamp or the like on the panel board.

That is, a spline groove 11 is formed at the tip of the input shaft 6, and a cylindrical ball holder 12 is spline-fitted into the groove 11 so as to be able to move forward and backward. A support cylinder 22 that stands up and supports the ball guide cylinder 21 is loosely fitted on the outer periphery of the holder 12, and the support cylinder 22 and
A pulley 8 supported through a bearing 23 is connected to a midway portion of the input shaft 6, and a rocking ball 15, which is housed in a vertical hole 24 of a ball guide tube 21 so as to be freely raised and lowered, is inserted into the vertical hole 24. The ball 15 is made to protrude from the lower end opening 25 of the vertical hole 24 by the biasing force of a biasing spring 26 provided in the vertical hole 24, so that the protruding portion of the ball 15 is pressed against the outer peripheral surface of the holder main body 12' of the ball holder 12.

The ball holder 12 has a stepped portion 13 of a constant height and a constant width formed on the outer circumferential surface of the rear end of the holder main body 12', and a ball locking groove 14 formed on the front circumferential side of the stepped portion 13. A locking ball 15 formed in a notch and urged in the pressure direction is engaged in the locking groove 14, and the ball holder 12 spline-fitted to the input shaft 6 and the pulley 8 The support cylindrical body 22 connected to the input shaft 6 rotates together to create a power transmission state (state B in FIG. 2). In this case, the locking ball 15 is disengaged from the ball holder (second
(state C in the figure), that is, the ball 15 is released from the ball locking groove 14, and the ball holder 12 is moved forward by the forward spring 19, rides up the stepped portion 13 of the holder 12, and then is pushed up and stored in the vertical hole 24 against the biasing force of the biasing spring 26, and although the support cylinder 22 rotates around the outer periphery of the ball holder 12, no power is transmitted to the input shaft 6. It is something.

Moreover, a wavy cam engaging portion 16 is formed at the front end of the holder body 12'.
6, as shown in FIGS. 4 and 5, is formed with a notch in a substantially inverted trapezoidal wave shape to form a tapered surface 17 on both sides of the circumferential surface, or a tapered surface 17 only on one side of the circumferential surface. is formed.

A sensor seat 18 is fitted into the end of the holder main body 12' on the axis side.
The rear end is formed into a relative shape so as to mesh with the cam engaging portion 16, and by rotating the sensor seat 18 by a certain angle, the sensor seat 18 and the holder main body 12' are relatively separated. It is structured as much as possible.

Further, 20 is a backward spring that urges the sensor seat 18 in the backward direction.

Therefore, the ball holder 12 spline-fitted to the input shaft 6 is always urged in the forward direction by the forward spring 19, and the sensor seat 18 engaged with the front end of the holder 12 is always urged by the backward spring 20. When the locking balls 15 are disengaged from the ball holder 12, a wrench is applied to the engaging portion 18'. When the sensor seat 18 is rotated by a certain angle by engaging a tool such as the above, the holder 12 is moved backward against the bias of the forward spring 19, and rotates around the outer circumference of the holder 12 together with the support cylinder 22. The moving locking ball 15 is locked in the ball locking groove 14,
It is possible to restore the so-called clutch connected state, and at this time, since the cam engaging portion 16 is provided with a tapered surface 17, the above-mentioned restoring operation can be performed easily.

Moreover, in the above ball clutch structure,
When the clutch is disengaged, the sensor seat 18 is also moved forward by being pressed by the ball holder 12, and the sensor seat 18 comes into contact with the sensor S disposed near the sensor seat 18, so that the sensor S is not detected. When activated, an alarm is issued to the operator of the driving section 7.

That is, the flange 18 is provided on the circumferential surface of the sensor seat 18.
-1 is provided in a protruding manner so that the front surface of the flange 18-1 comes into contact with the actuating arm S-1 of the sensor S disposed forward, and the arm S-1 activates the sensor switch S-1.
2 is pressed, and the sensor S is then activated.

Therefore, the sensor seat 18 functions as a sensor for restoring clutch connection and also contributes to sensing.
Although the pulley 8 is rotating, the sensor seat 18 cannot be rotated, so even if the sensor seat 18 acts on the sensor S, there is no risk of damaging the sensor S. It is something.

In the figure, 41 is a ball holder, 42 is a spring fixing bolt, 27 is a transmission bevel gear, 28 is a fixed bolt, 29 is a grass divider plate, 30 is a pulling device, 31 is a tip conveying chain, and 32 is a stock conveying chain. ,3
3 is a handling cylinder, 34 is a feed chain, 35 is a swinging sorting device, 36 is a winnowing machine, 37 is a No. 1 conveyor, 3
8 is the second conveyor, 39 is the second grain lifting cylinder, and 40 is the cutting blade.

The present invention can be used in all power transmission mechanisms having a ball engagement clutch mechanism in power working machines, such as a pulley for interlocking the handling barrel 33 of a combine harvester, a pulley for interlocking the cutting blade 40, etc. You may use it.

[Brief explanation of the drawing]

Fig. 1 is a side view of a combine harvester having a ball clutch structure according to the present invention, Fig. 2 is an enlarged side view of the main parts, Fig. 3 is an enlarged side view of the main parts, Figs. The figure is an enlarged development view of the cam engaging part. A: Combine harvester, S: Sensor, 12: Ball holder, 15: Rocking ball, 18: Sensor seat.

Claims (1)

[Scope of utility model registration request] Between the power transmission pulley 8 and the input shaft 6,
Locking ball 1 as a ball clutch mechanism
5 and a ball holder 12 that engages with the ball 15 and transmits power from the pulley 8 to the input shaft 6 side, and the ball holder 12 is slidably attached to the input shaft 6 side. In the event of an overload, the ball holder 12 is configured to be able to disengage from the ball 15, and when the ball holder 12 slides and the ball clutch is disconnected, the input shaft 6 and ball holder 12 are configured to stop, and furthermore, a sensor seat 18 which also serves as a return seat for restoring the holder 12 to the clutch connected state is connected to the cam at the end of the axis side of the ball holder 12. An alarm sensor S is provided on the outside of the sensor seat 18, and is connected to the sensor seat 1 through the coupling portion 16 and the reverse spring 20, and slides when the ball clutch is disengaged.
A ball clutch structure of a pulley for power transmission configured to activate a sensor S for alarm by 8.