CN1018469B - Flexible steel belt type overrunning clutch - Google Patents

Abstract

The invention relates to a novel overrunning clutch, which belongs to a mechanical transmission basic part.A core part of the clutch is a self-locking mechanism consisting of a flexible steel ring, a lap plate and a control key, and an outer ring drives an inner core to rotate through the self-locking mechanism during forward transmission; when the steel ring moves reversely, the steel ring and the inner core are automatically separated to realize overrunning. The overrunning clutch has the characteristics of reliable forward locking, small reverse opening force, large transmission capacity and long service life.

Description

The invention relates to a novel overrunning clutch, which belongs to the basic part of mechanical transmission.

Among the existing overrunning clutches, there are two better forms, the roller type and the wedge type, which utilize the principle of inclined plane wedging. There are two main disadvantages in the prior art: one is that the rollers are in line contact with the surfaces of the inner and outer rings, and the contact stress is very large when wedging is tight, which can easily cause local wear and self-locking; opening force.

The purpose of the present invention is to address the shortcomings of the prior art, and replace the traditional overrunning clutch principle with a new overrunning clutch principle, that is, replace line contact with surface contact, and realize self-locking by applying the principle of flexible belt friction. In addition to greatly reducing the surface contact stress, it also has the special effect of making the opening force very small, which is particularly beneficial to the application. Tests have proved that, in addition to the transmission capacity can be increased many times, the durable life can be almost infinite, that is, there will be no wear and tear failure of the working surface. At the same time, because the opening force is very small, it is especially suitable for the output mechanism of the pulsating continuously variable transmission device.

The content of the present invention is that the flexible steel belt type overrunning clutch is made up of outer ring, inner core, flexible steel ring, lap joint plate and control key. The flexible steel ring is an open steel ring, which forms a self-locking mechanism with the lap plate and the control key, and is installed between the outer ring and the inner core. One end of the flexible steel ring is fixedly connected with the lap plate, and the other end is opened with a through square hole opposite to the lap plate. One end of the control key is inserted into the square hole, and the other end is placed in the trapezoidal groove of the outer ring. When the outer ring rotates in the forward direction, the control key pushes the lap joint plate and the flexible steel ring into a self-locking state, holds the inner core tightly and outputs the motion. When the outer ring rotates in the opposite direction, the control key makes the flexible steel ring loose and can freely rotate on the inner core to realize overtaking.

Description of drawings:

Fig. 1 is prior art.

Figure 2 is an embodiment of the present invention.

Fig. 3 is a schematic diagram of the mechanism assembly of the embodiment.

The specific content of the present invention will be described in detail below in conjunction with the accompanying drawings. Fig. 2 and Fig. 3 are a concrete embodiment of the present invention. Among the figure, 1 is an outer ring, 2 is an inner core, 3 is a flexible steel ring, 4 is a lap plate, 5 is a control key, 6 is a leaf spring, and 7 is an S-shaped spring. A self-locking mechanism consisting of a flexible steel ring 3 , lap plates 4 and control keys 5 is installed between the outer ring 1 and the inner core 2 . The flexible steel ring 3 is an open steel ring, one end is fixedly connected with the lap plate 4, and the other end is provided with a through square hole opposite to the lap plate, one end of the control key 5 is inserted into the square hole, and the other end is placed on the In the trapezoidal groove of the outer ring 1. When the outer ring 1 rotates in the forward direction as shown in Figure 2, the control key 5 pushes the lap plate 4 and the flexible steel ring 3 to enter the self-locking state, hugs the inner core 2 and outputs the movement, when the outer ring 1 reverses When rotating to, control key 5 makes flexible steel ring 3 loosen, and can freely rotate on inner core 2, realizes surpassing. In order to improve the sensitivity of locking and opening during forward and reverse movement and eliminate the lost motion of forward and reverse switching, leaf spring 6 and S-shaped spring 7 are installed. Leaf spring 6 is installed on the control key upper end side, plays the effect of eliminating control key backlash. The S-shaped spring 7 is placed on the top of the lap plate 4, which plays a role in improving the sensitivity and can also reduce the reverse lost motion.

The invention has simple structure and convenient processing. The outer ring 1 can be made of cast iron or aluminum, and the inner core 2 can also be made of common steel, so the cost is relatively low. The present invention also has the following technical effects:

1. The transmission capacity is large, about 10 times larger than that of the roller type.

2. The reverse opening force is small, and almost no force is required.

3. There is no wear and tear failure phenomenon on the self-locking surface.

4. Switching is smooth without impact noise.

5. The structure is simple, the manufacture is convenient, and the cost is low.

Claims (2)

1, a kind of flexibility steel band type over running clutch, comprise outer shroud, inner core, it is characterized in that also comprising flexible steel loop, lapping plate and control key, described flexible steel loop, lapping plate and control key are formed a self-locking mechanism, be installed between outer shroud and the inner core, flexible steel loop is the opening steel loop, and an end and described lapping plate are fixedly connected, and the other end and lapping plate relative position have the square hole of perforation, one end of described control key inserts this square hole, and the other end is inserted in the dovetail groove of outer shroud.

2, free wheel device as claimed in claim 1 is characterized in that laying S type spring sheet on the top of described lapping plate, and one side is equipped with the sheet spring in described control key upper end.

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