JPS59532Y2 - Transmission device for power transmission belt - Google Patents

Description

[Detailed description of the invention] This invention is applicable to transmission belts for agricultural machinery, general industry, automatic 2
This is related to the transmission belt transmission device for wheeled vehicles, snowmobiles, automobiles, etc., and the ■-shaped transmission pulley piece fixed to the shaft and the belt holder that protrudes from the bottom of the transmission surface are provided with a tongue and are rotatably attached to the shaft. By providing a transmission mechanism in which a V-belt is wound between a driving pulley consisting of a ■-shaped idler wheel piece and a driven pulley consisting of a normal ■-shaped variable speed pulley, power transmission can be frequently and repeatedly interrupted, especially in agricultural machinery. , the so-called
The purpose is to improve clutch disengagement (stopping) and increase the gear ratio.

Conventionally, in the transmission mechanism of agricultural machinery such as combine harvesters, rice transplanters, binders, etc., as shown in FIG. The function is to activate the clutch off (clutch disengagement, stop) and clutch on (drive), but in the conventional method described above, the belt 4 needs to be loosened in order to activate the belt clutch action, so the back side of the belt 4 Since the amount by which the shaft is pushed inward, that is, the amount of movement is slack from the beginning, the gear ratio between the drive shaft and the driven shaft cannot be increased.

Therefore, in order to improve this drawback, a method was adopted in which the belt 4 is pulled outward by a tension pulley 3, as shown in Fig. When the tension pulley 3 is moved downward to a position where the tension is not transmitted to the pulley 2 and a clutch action is applied with the tension loosened, the vibration of the belt 4 causes the belt 4 to
(2) tends to come off from the groove of the pulley, and there is also the problem that extra space is required to pull the tension pulley 3 outward.

On the other hand, recently, as shown in FIG. 3, a belt 4 is wound between the drive pulley 1 and the driven pulley 2, and the belt
There is a method in which a tension pulley 3 with an attached tension pulley 3 is installed at an appropriate position such as a, l), or c, thereby causing a clutch action.

This is a method in which the tension on the belt 4 is loosened while holding down the belly surface of the belt with a belt presser 5, and the bells 1 to 4 are separated from the drive pulley 1 as shown by the dotted line, completely cutting off the transmission of power. Although it is possible to increase the amount and the gear ratio, this not only makes it difficult to position the belt presser due to the transmission mechanism and belt specifications, but also causes the belt 4 Since the bell 1 to the presser foot 5 suddenly come into contact with each other, there is a problem that the belly surface of the belt is damaged and a slipping sound is generated.

Furthermore, in all of the above conventional methods, when the belt is started, that is, when the clutch is turned on, slipping, slipping noise, belt heat generation,
Not only does the wear greatly affect the life of the belt, but also the impact when the clutch is turned on or off is large, damaging the device itself, and there are also safety issues for the workers.

This invention was completed as a result of intensive research in order to solve the conventional problems as mentioned above. One of the ■-shaped variable speed pulley pieces is fixed to the shaft, and a ring is provided on the bottom of the belt holder. It is characterized by a configuration in which the other ■-shaped looser piece is attached oppositely to the one pulley piece so as to be rotatable via a bearing, and the ■-shaped variable speed pulley having such a configuration is used as a drive pulley, and , an ordinary spring-type variable speed pulley is used as the driven pulley, and when the clutch is on, the belt is placed on the top of the drive pulley and on the bottom of the driven pulley, and both pulleys are rotating together, but when the clutch is off, the belt is The belt holder moves to the lower surface of the drive pulley and comes into contact with the ring and the moving surface of the loose piece, and is separated from one of the V-shaped speed change pulley pieces to stop the loose piece and the driven pulley.

Hereinafter, the specific configuration of the present invention will be further explained in detail with reference to the accompanying drawings.

FIG. 4 is a cross-sectional view of the transmission device according to the present invention when the clutch is turned on. In the figure, reference numeral 11 denotes a ■-shaped pulley piece that functions as a moving vehicle and is fixedly attached to a shaft 17 with a bolt 16.

On the other hand, the other pulley piece 12 installed at a position opposite to this is a V-shaped pulley piece that serves both as a moving vehicle and as a swing arm, and at the bottom of its transmission surface there is a part that protrudes toward the ■-shaped pulley piece 11 side with respect to the transmission surface. The belt receiver is formed so that the ring 13 is separated from the fixed ■-shaped pulley piece 11, and inside the pulley piece 12 there is a radial ball bearing 14 that rotates in the rotational direction of the shaft 17, and furthermore, a bearing is provided on the outer surface of the belt support. 15 are inserted and fixed, respectively, and are also movable in the axial direction.

The fixed one of the ■-shaped pulley pieces 11 and the above-mentioned ■-shaped pulley pieces 12 which include the bearings 14 and 15 therein, furthermore, the belt support of the pulley pieces 12 is connected to the ring 1.
The belt holder is a thrust ball bearing 1B with approximately the same width as the ring 13 so that the ring 3 does not come into contact with one of the pulley pieces 11.
and the latter pulley piece 1
2 has a bundle 22 at its lower end and is pressed by a presser roller 20 attached to the tip of the clutch lever 19 via an arm support bearing 21 to form a V-shape. (2) When the belt 10 is wound around the pulley piece 12, the pulley pieces 11 and 12 are driven together with the shaft 17 by the pressing force of the presser roller 20 on the pulley piece 12.

At this time, the pulley piece 12 functions as a moving vehicle, and the pulley piece 1
The bearing 14 inserted into the holding roller 2 does not exhibit a rotational function due to the pressing force of the presser roller 20.

Therefore, the transmission device consisting of the speed change pulley shown in FIG. , the driving pulley and the driven pulley have an alignment deviation 11, and the extension of the radial center line of the driven pulley is biased toward the movable ■-shaped pulley from the radial center line of the driving pulley. and place it.

Therefore, the belt is wrapped around the belt in a slightly diagonal manner.

FIG. 5 is a cross-sectional view of the transmission according to the present invention as described above, but in this case, the clutch is off, and the clutch lever 19 is rotated by the bundle 22, and the presser roller 20 is moved in the circumferential direction. By doing so, both pulleys 11,
The belt 10 fitted above between 12 moves downward,
At the same time, the belt 10 contacts the transmission side of the pulley piece 12,
The belt holder protruding from the bottom of the pulley piece 12 is wound around the ring 13 and moves in the axial direction together with the pulley piece 12, increasing the distance between the pulleys 11 and 12, and the belt 10 is fixed. The pulley piece 11 is separated, and at this time,
■The variable speed pulley piece 11 rotates together with the shaft 17,
In the belt holder around which the belt 10 is wound, the V-shaped pulley piece 12 integrated with the ring 13 functions as a freewheel due to the idling function of the radial ball bearing 14, and together with the driven pulley, the power is cut off and the belt is stopped.

In the above case, if we look at the positional relationship between the drive pulley and the driven pulley, when the diameter of the drive pulley is at its maximum, the driven pulley will move the center line in the radial direction to the movable shape of the drive pulley, as shown in Figure 4. The pulley piece 12 is disposed with a deviation l□, but as the drive pulley diameter becomes smaller, this deviation 11 gradually decreases until the drive pulley diameter in Fig. 5 is the minimum. When reaching the clutch-off position, the radial center line of the drive pulley is kept offset by a distance of 12 toward the movable ■-shaped pulley piece 12.

At this time, it is desirable that 12 > 0, but
As 1° increases, 11 naturally also increases, so it is preferable to keep 12 to the minimum necessary.

Note that a belt suspended between both driving and driven pulleys usually has a core wire, and has a tendency to deviate in a direction perpendicular to the running direction of the belt depending on the direction in which the core wire is twisted.

Therefore, if the bias tendency is on one side of the movable pulley of the drive pulley, consider setting 1□ in the negative direction, that is, on one side of the fixed pulley.

Furthermore, if the tendency of deflection with respect to belt running is opposite to the above, it is also necessary to consider increasing the value of 12 in the positive direction, that is, in the opposite direction.

In any case, minimizing the values of 11 and 12 necessary to prevent contact between the belt and the fixed pulley piece 11 of the drive pulley at the clutch-off position will reduce misalignment and improve the running performance of the belt. It will increase it.

In addition, in the figure, the same parts as in FIG. 4 are indicated by the same reference numerals.

Next, the operating mechanism of the transmission according to the present invention will be explained. First, FIG. This is a transmission mechanism in which a variable-speed square belt 10 is wound between the two pulleys (Dn), and the belt 10 can be turned on and off by changing the effective diameter between both pulleys.

That is, when the pulley piece 12 is pressed by the presser roller 20 in FIG. While rotating, when the belt 10 moves below the driving boob IJ (Dr) due to the movement of the presser roller 20, the effective diameters of the driving boob IJ (Dr) and the driven boob IJ (Dn) also change (r2) and (R2), respectively. ), the speed becomes low, and the position of the winding of the belt 10 also moves from 10'' to 10''.

When the belt 10 is further moved below the drive boob IJ (Dr), only one side of the belt 10 comes into contact with the transmission side of the pulley piece 12 as shown in FIG. is wound around and moves in the axial direction together with the pulley piece 12, and is separated from the fixed pulley piece 11, and the effective diameters of the driving pulley (Dr) and driven pulley (Dn) also change to (ra) and (R3). The belt 1 is wound around the driven pulley (Dn) via the radial ball bearing 14 and the bearing 15 with the clutch off.
0 is the position 10' in the figure, and the power transmission is cut off.

In this case, the fixed square pulley piece 11 is rotating together with the shaft 17.

In this way, the ■-shaped pulley piece 12 functions as a moving vehicle together with the fixed ■-shaped pulley piece 11 when the clutch is on.
When the belt 10 is clutched off, the belt 10 moves below the pulley piece 12, the belt holder is wound around the ring 13, and is separated from the fixed pulley piece 11. Together with the idling function of the radial ball bearing 14, It stops and functions as a military force.

Next, when turning the clutch on from the clutch-off state, the belt 10 comes into contact with the fixed pulley piece 11 by turning the handle 22 of the clutch lever 19 and pressing the lower end of the pulley piece 12 again with the presser roller 20. While gradually moving upward, at the same time the ■-shaped pulley piece 11.12
Since it is not driven as a moving vehicle, the effective diameter of the pulley and the gear ratio change, and the belt 10 is clutched on as shown in FIG. 4, and becomes completely driven.

In this way, clutch-on and clutch-off of the belt 10 can be repeated by moving the presser roller 20 attached to the clutch lever 19 to expand and contract the interval between the ■-shaped pulley pieces 11 and 12.

As described above, according to the belt transmission device of the present invention, one of the ■-shaped transmission pulley pieces is fixed to the shaft as the drive pulley, and the belt holder is provided with a ring on the bottom surface so that it can be rotated inside the shaft. A transmission device consisting of loose pieces attached oppositely through bearings is used, and a normal spring-type variable speed pulley is used as the driven pulley, and the loose pieces of the drive pulley are held down by a roller or other means to move the drive pulley in the axial direction. This mechanism operates the clutch-on and clutch-off of the belt by moving the belt as appropriate, and also changes the circumferential speed of the belt, and has the following remarkable effects.

(1) Since the belt is moved up and down between the fixed V-shaped pulley pieces and the ■-shaped variable speed pulley pieces, which are both movable and idle, on the same transmission surface, it is different from the conventional clutch mechanism. There is no need for the belt to loosen as much as when the clutch is off, and the belt remains in tension both when the clutch is off and when shifting, the amount of belt movement is small, and a large gear ratio can be achieved in the same space.

(2) Since the belt is moved while running between the moving vehicle and the idler, there is no strong shock like in the past, even when the clutch is repeatedly turned on and off, and it can start and stop smoothly. is possible,
It is also possible to prevent belt slippage, slipping noise, belt heat generation, and wear due to shock.

(3) Damage to the pulley and other devices as a whole can be prevented by alleviating the impact, and safety for workers can be improved.

[Brief explanation of the drawing]

Figures 1 to 3 are schematic side views of a conventional transmission mechanism, Figure 4 is a cross-sectional view of the transmission when the clutch is on according to the present invention, and Figure 5 is a cross-sectional view of the transmission when the clutch is off according to the present invention. 6 is a schematic side view of a transmission mechanism using the transmission according to the present invention. 10... Belt, 11... Fixed side V-shaped pulley piece, 1
2... ■Type floating pulley piece, 13... Belt holder is ring, 14... Radial ball bearing, 15...
Bearing, 16...Fixing pole 1~. 11...axis, 1B
...Thrust ball bearing, 19...Clutch lever 120...Press roller, 21...Arm support bearing, 22...Handle.

Claims (1)

[Scope of utility model registration request] A pair of V-shaped pulley pieces are placed opposite to each other on the shaft, one of the ■-shaped pulley pieces is fixedly attached to the shaft, and the belt holder of the other V-shaped pulley piece that protrudes from the bottom of the transmission surface has a non-edge shape. The drive pulley is a variable speed pulley that is rotatably mounted inside via a bearing and a bearing.
The normal ■-shaped variable speed pulley is used as the driven pulley, and the radial center lines of both variable speed pulleys are shifted from each other, so that the extension of the radial center line of the driven pulley is relative to the center line of the driving pulley, and the movable A transmission belt transmission device characterized in that a pulley is arranged so as to be offset to one side, and a ■-shaped belt is wound around both transmission pulley pieces.