JPS6243139Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a disc clutch, and aims to prevent the driven shaft from continuing to rotate due to inertia after the clutch is disengaged, and to provide one that can stop the driven shaft at the same time as the clutch is disengaged.

In the conventional disc clutch, as shown in Fig. 4, the bracket B, which performs the clutch action, is moved in the axial direction by bringing the clutch facing F on the driving side 1' and the friction plate P on the driven shaft side 2' into contact with each other. The clutch lever L operated via a ball bearing (or thrust bearing) b between the clutch lever L and the bracket B. This is attached to the housing and bracket B which rotates at a constant speed together with the driven shaft 1'.
This takes into consideration the relative speed at the time of contact with the clutch lever L in a stationary state.

However, in the case of the above structure, even after the clutch is disconnected and the power transmission between the driving shaft 1' and the driven shaft 2' is cut off, the driven shaft 2' is still affected by its own inertia (residual torque). It will continue to rotate for a while, and it will be a waste of time until it stops completely.
Particularly in the case of agricultural mowers, etc., the cutter continues to rotate even after the clutch is disconnected, which is extremely dangerous.

Therefore, in this invention, the above-mentioned drawbacks are solved, and the rotation of the driven shaft side can be stopped at the same time as the clutch is disengaged.The structure is such that the clutch facing on the drive side is replaced by the friction facing on the driven shaft side. a disc clutch sandwiched between friction plates, which rotates integrally with a driven shaft and is movable on the driven shaft, and a bracket capable of bringing the clutch facing and friction plate into and out of contact with each other; A friction member that is attached to at least one of a clutch lever that is mounted on the clutch housing and can move forward and backward by rotation and can be pressed into contact with the bracket, and a contact surface between the clutch lever and the bracket. It is characterized by being made of lining material.

Next, embodiments of this invention will be illustrated below with reference to the drawings.

1 is a clutch pulley on the driving side, which is connected to a driving force such as an engine or a motor. Reference numeral 10 denotes a suitable number of friction facings that mesh with the inner surface of the clutch pulley 1 and rotate together with the clutch pulley 1.

2 is a driven shaft, which transmits power to a working member such as a cutter of a mower. 20 is a passive plate which is fitted and fixed to the driven shaft 2. 21 is a bracket, and the arm 22 of the bracket 21 is fitted into an appropriate number of holes provided on the circumference of the passive plate 20, and as the driven shaft 2 rotates, the passive plate 20 and the bracket 21 are inserted.
The bracket 21 rotates, and since the bracket 21 is separated from the driven shaft 2 and is not fixed in the axial direction, it is movable in the axial direction independently of the driven shaft 2 and the driven plate 20. . 23 is a retaining ring, and an appropriate number of friction plates 24 are arranged between the retaining ring 23 and the passive plate 20 so as to sandwich the clutch facing 10 therebetween. The friction plate 24 is configured to rotate together with the driven shaft 2. A spring 25 is installed in a receiving tube 26 attached to the passive plate 20, and one end is in contact with the bracket 21. The repulsive force of the spring 25 causes the retaining ring between the bracket 21 and the passive plate 20 to close. 22, the friction plate 24 and the clutch facing 10 are closely pressed against each other.

3 is a housing, and a cam holder 30 is fixed to this housing 3. A clutch lever 31 is rotatably fitted into the cam holder 30, and cam ridges 32, 32' are provided on opposing surfaces of the cam holder 30 and the clutch lever 31.
are formed respectively, and the clutch lever 3
1 changes the abutment position of the cam ridges 32, 32', thereby moving the clutch lever 31 toward the bracket 21.

A friction lining material 33 is bonded to the end surface of the clutch lever 31 on the bracket 21 side, and this friction lining material 33 is made mainly of, for example, asbestos, and is used for clutch facings. made of the same material. It is preferable that the abutment surface of the bracket 21 is also finished smooth to ensure good contact with the friction lining material 33. It is assumed that the clutch lever 31, the friction lining material 33, and the bracket 21 are normally attached with a slight gap between them.
As shown in the figure, the friction lining material 33 that is bonded to the clutch lever 31 side is easy to manufacture;
Although the operability is good, it is also possible to join the friction lining material 33 to the bracket 21 side (not shown).

Next, the operation of the disc clutch having the above structure will be explained.

First, when the clutch is connected, the torque applied to the drive side clutch pulley 1 passes through the clutch facing 10 to the clutch plate 2.
4, and further from the driven plate 20 to the driven shaft 2.
The torque transmitted to the machine operates various work members.

To disengage the clutch, press the clutch lever 31.
Rotate and advance to the bracket 21 side. The friction lining material 33 is brought into contact with the bracket 21 rotating together with the driven shaft 2, and the bracket 2
1 is moved against the repulsive force of a spring 25. At this time, the rotating bracket 21 and the friction lining 33 are in contact with each other while sliding relative to each other. As the bracket 21 moves, the pressing force between the friction plate 24 and the clutch facing 10 weakens, and eventually they separate and no longer transmit torque.

The clutch is now disengaged, but at this time, the inertia force (residual torque) remaining on the driven shaft 2 side is absorbed by contact with the friction lining 33 pressed against the bracket 21, and the driven shaft 2 is The rotation can be stopped almost simultaneously.

Regarding the direction of rotation of the clutch lever 31, when the clutch lever 31 is rotated in the direction opposite to the rotation of the bracket 31 and the driven shaft 2, the clutch lever 31 is constructed so as to be able to advance and push against the bracket 21. However, the friction lining material 33 has good absorption performance of the rotational force of the bracket 21.
It also becomes easier to operate the clutch bar 31 (second
figure). That is, when the clutch lever 31 is rotated in the same direction as the rotation direction of the bracket 21 and comes into contact with each other, the clutch lever 31 is further rotated by the rotational torque generated by the contact between the bracket 21 and the friction lining material 33. This is because the cam ridges 32, 32' may cause a biting action due to the force acting in the same direction, making it impossible to operate the clutch lever 31 (FIG. 3).

Therefore, when the driven shaft 2 needs to rotate in both forward and reverse directions, the structure of the cam ridges 32, 32' of the clutch lever 31 and cam holder 30 can be changed so that the bracket 21 can be rotated either left or right when the clutch lever 31 is rotated. so that it can be moved to the side,
When disengaging the clutch, the clutch lever 31
It is preferable that the bracket 21 can always be rotated in the opposite direction to the bracket 21 (not shown).

According to the disc clutch of this invention constructed as described above, when the clutch is disengaged, the contact between the clutch lever that moves the bracket and the bracket is maintained through the friction lining material without providing a bearing between them. Since it is in direct contact, the friction lining material can absorb the inertia force (residual torque) remaining on the driven shaft side at the same time as the clutch is disengaged.
The driven shaft can be stopped at the same time as the clutch is disengaged. What's more, the contact between the bracket and clutch lever does not involve metal surfaces touching each other, but through a friction lining material with excellent wear resistance, ensuring durability and long-term use even after repeated clutch disengagement operations. In addition, it is easy to carry out repair work.

Therefore, various working members such as the mower's cutter attached to the driven shaft can be quickly stopped, which is extremely effective in improving work efficiency and ensuring safety. In addition, the structure is not more complicated than conventional ones, and the manufacturing cost is relatively low, so it has excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the disc clutch of this invention, FIGS. 2 and 3 are illustrations of the operation of the clutch lever, and FIG. 4 is a sectional view of a conventional example. 1... Driving side clutch pulley, 10... Clutch facing, 2... Driven shaft, 21... Bracket, 24... Friction plate, 3...
Housing, 31...Clutch lever, 33...
Friction lining material.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A disc clutch consisting of a clutch facing on the driving side sandwiched between friction plates on the driven shaft side, which rotates integrally with the driven shaft and rotates on the driven shaft. a bracket that is movable and capable of bringing the clutch facing and friction plate into and out of contact with each other; a clutch lever that is mounted on the clutch housing and that can move forward and backward by rotation and that can be pressed into contact with the bracket; A disc clutch comprising a friction lining material bonded to at least one of the contact surfaces of the clutch lever and the bracket. 2. The disc clutch according to claim 1, wherein the clutch lever is rotated in the opposite direction to the bracket when it is extended.