JPS605144Y2 - tension clutch device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tension clutch device for a belt transmission device that tensions or relaxes a belt wound between drive and driven pulleys by connecting and separating the tension pulley to interrupt power. The tension clutch components can be reliably assembled by the support plate formed on the cover that covers the entire device, and the entire device can be configured compactly.
To provide a device that allows clutch operation to be performed safely and accurately.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are a plan view and a side view showing a belt transmission device and a tension clutch device, respectively, and show an engine 1.
A belt transmission device is constructed by wrapping a transmission belt 9 around a drive pulley 3 keyed to the drive shaft 2 of the actuator 4 and a driven pulley 6 keyed to the input shaft 5 of the actuating device 4. , covered by a support 12 which functions as a transmission cover.

Reference numeral 10 denotes a tension pulley, which is rotatably supported by a shaft 8 at the tip 7a of the tension arm 7 so as to be able to come into contact with the belt 9.

The base 7b of the tension arm 7 is rotatably supported by the tension arm support shaft 11 on the outer vertical wall of the support 12, and the base is provided with a locking piece 13 that rotates together with the tension arm. .

On the other hand, a clutch lever 14 is rotatably supported on other parts of the outer vertical wall of the support body 12.
One end extends outward from the support body 12 and serves as an operating portion 14b.
Further, an operating cam body 16 is fixed to the inner end of the support shaft 15 of the base portion 14a.

As shown in FIGS. 2 and 3, the operating cam body 16 has an elliptical shape in side view, and is set in a positional relationship such that its outer cam surface slides into contact with the upper surface 7c of the tension arm 7 described above. It will be established as follows.

Further, this operation cam body 16 is arranged so that the clutch lever 14 is in the third position.
When the clutch lever 14 is at the phantom line position in the figure, the tension arm 7 is allowed to swing upward, and when the clutch lever 14 is swung from the phantom line position in Fig. 3 to the solid line position in the same figure, the tension arm 7 is forcibly moved. It is installed so that it can be pressed down.

A tensioning spring body 17 is interposed between the operating cam 16 and the locking piece 13, that is, between the tension arm 7 side and the clutch lever 14 side, so that the tension pulley is not normally engaged. 10 urges the belt 9 to maintain tension.

In this configuration, when the clutch lever 14 is positioned in the state shown in FIG. 2, the operating cam body 16 that operates integrally with the lever 14 is in a position where the tension arm 7 can be swung upward. Forced by the spring body 17,
The tension pulley 10 is pressed against the transmission belt 9,
The transmission belt 9 is brought into a transmission state.

When changing from a transmission state to a transmission disconnection, use the clutch lever 14.
3, and move it from the imaginary line position in FIG. 3 to the solid line position in the same figure (in the A direction).

Then, the operation cam body 16 also moves along with this operation and pushes the tension arm 7 downward with the long diameter part of the outer cam surface, so the tension pulley 10 separates from the transmission belt 9, releasing the tension on the belt and making it into a non-transmission state. Since the operation support body 2 of the clutch lever 14 is covered on the outside, the operator can work safely.

In the present invention, a tension pulley 10 in a tension clutch device of a belt transmission device is rotatably supported at the tip of a tension arm 7, and the base end of the tension arm is
A clutch lever 14 is swingably supported on a vertical wall of a support plate 12 provided to cover the belt transmission device, and a clutch lever 14 having an operating portion 14b extending outward is provided on another part of the vertical wall of the support plate. The operating cam body 16 is installed on the inner end of the clutch lever, and this operating cam body is connected to the tension arm 7.
A spring body 17 is interposed between the tension arm and the clutch lever to urge the tension arm to swing in the belt tensioning direction. It has the following advantages:

1. Since the tension clutch device components are supported and mounted using the vertical wall portion of the support body 12 which has the function of covering the belt transmission device, the structure is extremely simple without the need for any special members for supporting the device. became.

2 Although the tension clutch device is compactly installed by being supported on a support that has the function of covering the belt transmission device, the switching operation of the tension clutch device can be performed outside the cover of the support 12, so the operation is extremely safe. It is.

3 The tension arm and clutch lever are provided on the support body, and the tension arm is directly actuated by the clutch lever so that it can be actuated in a selective manner for switching operations, reducing the number of required parts and making it more reliable. It is possible to switch to

4 The tension clutch device is installed so that it can be operated directly on the belt transmission device, so when starting the engine,
The clutch can be engaged and engaged while the engine is in the starting position, and the engine can be started easily by disengaging the clutch.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a belt transmission mechanism implementing the tension clutch device of the present invention, and FIG. 2 is a side view of the same.
FIG. 3 is an explanatory diagram of the operation. 7...Tension arm, 8...Tension arm support shaft, 9...Tension pulley,
10...Transmission belt, 11...Clutch lever support shaft, 12...Support body, 14...
...Clutch lever 114b...Operation section, 16
......Operation cam body, 17... Spring body.

Claims (1)

[Scope of utility model registration request] In the tension clutch type belt transmission device, the power is interrupted by tensioning or relaxing the belt 9 wound between the driving pulley 3 and the driven pulley 6 by approaching and separating the tension pulley 10.
a support plate 12 which is rotatably supported at its tip and whose base end is provided to cover the belt transmission device;
The clutch lever 14, which has an operating portion 14b extending outward, is attached to another part of the vertical wall of the support plate so as to be swingable, and the clutch lever 14 is operated at the inner end of the clutch lever. A cam body 16 is installed, and this operating cam body contacts the tension arm 7 to swing the tension arm by operating the clutch lever, and the tension arm is connected to a belt between the tension arm and the clutch lever. A tension clutch device including a spring body 17 that swings and biases in the tension direction.