JPH0729335Y2 - Spring force type tension device for belt transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a spring pressure type tension device for a belt transmission device, and more particularly to a device capable of easily moving a tension pulley.

[Basic Structure] The basic structure of the spring pressure type tension device of the belt transmission, which is the premise of the present invention, is as follows.

For example, as shown in FIGS. 1 (A) and (B) and FIG.
The transmission belt 2 of the belt transmission device 1 is wound around the main drive pulley 3, the driven pulley 4 and the tension pulley 5, and the pulley guide elongated hole 8 is provided in the side wall portion 7 of the pulley support frame 6 of the tension pulley 5 in the tension direction 9. It is formed by guiding the pivot shaft 10 of the tension pulley 5 to the pulley guide elongated hole 8 so as to be able to move back and forth, and elastically pressing in the tension direction 9 by the tension spring 11.

[Prior Art] In the above-mentioned basic structure, conventionally, no means for easily moving the tension pulley 5 is provided.

[Problems to be Solved by the Invention] Therefore, the above-mentioned conventional technique has the following problems.

When removing the transmission belt 2, the tension pulley 5
Must be moved in the direction 25 opposite to the tension direction 9 against the tension spring 11, but when moving the tension pulley 5, it is necessary to directly touch the tension pulley 5, so a strong operation is required. The force is required, and since the tension pulley 5 is loosened and is easily removed from the hand, it requires skill to perform the work and the working time becomes long.

The present invention is to facilitate the movement operation of the tension pulley in the work of removing the transmission belt,
Is the task.

[Means for Solving the Problems] In the basic structure, the present invention provides a tension pulley 5
It is characterized in that the means for moving is as follows.

For example, as shown in FIGS. 1A and 1C, one of the upper and lower side wall portions 12 and 13 of the pulley support frame 6 is one side wall portion.
A long hole 15 for releasing operation of the tension release rod 14 is opened in 12 along the tension direction 9, and the other side wall portion 13
The mooring portion 16 of the tension release rod 14 is provided on the.

[Effect] The present invention has the following effects.

Insert the tension release rod into the pulley support frame through the release operation long hole, moor the tip of the tension release rod to the mooring part, and move the tension release rod along the release operation long hole with the mooring part as a fulcrum. Moves in the direction opposite to the tension direction against the tension spring together with the pivot shaft that contacts the circumferential side of the tension release rod. As the action can be used, a small operation force is required, and since the tension release rod has no room for accidental disengagement from the pivot shaft, no skill is required for work, work time can be shortened, and in removing the transmission belt , The tension pulley can be easily moved.

In obtaining the above effect, since it is only necessary to form the release operation long holes and the mooring portions on the upper and lower side wall portions of the pulley support frame, it is possible to carry out with a simple structure at a low cost without adding new parts. .

[Embodiment] An embodiment of the present invention will be described with reference to the drawings.

1 and 2 are views for explaining a spring pressure type tension device of a belt transmission device according to an embodiment of the present invention. FIG. 1 (A) is a front view of the tension device and FIG. 1 (B) is First
FIG. 1A is a sectional view taken along the line BB of FIG. 1A, FIG. 1C is a view in the direction of arrow C of FIG. 1A, and FIG. 2 is a front view of an engine equipped with a belt transmission.

In FIG. 2, reference numeral 17 indicates an engine.

The engine 17 is a vertical forced air-cooling engine, and supplies cooling air to the cylinder 19, the cylinder head 20, etc. by the pressure-feeding force of the cooling fan 18.

This engine 17 has a cylinder on top of the crankcase 21.
The cylinder head 20 is assembled on the upper portion of a cylinder block 22 integrally formed with 19, the belt transmission 1 and the cooling fan 18 are arranged on the front surface, and the belt transmission 1 is provided with a spring pressure type tension device 23. There is.

The belt transmission device 1 is configured by winding a transmission belt 2 around a driving pulley 3, a driven pulley 4 and a tension pulley 5.

By mounting the main drive pulley 3 on the crankshaft 24 and the cooling fan 18 on the driven pulley 4, the cooling fan 18 can be interlocked with the output from the crankshaft 24.

The spring pressure type tension device 23 is for applying a tension to the transmission belt 2, and a pulley guide elongated hole 8 is formed in the side wall portion 7 of the pulley supporting frame 6 of the tension pulley 5 along the tension direction 9, A pivot shaft 10 of the pulley 5 is guided in a pulley guide elongated hole 8 so as to be able to move back and forth, and a tension spring 11 elastically presses in a tension direction 9.

The pivot shaft 10 has flat guide surfaces 27 on both sides of the intermediate portion 26 on the circumferential side.
By forming the intermediate portion 26 of the pivot shaft 10 into the pulley guide elongated hole 8, the guide surface 27 is slid to the inner peripheral edge of the pulley guide elongated hole 8 to move the pivot shaft 10 to the pulley guide elongated hole. I'm trying to get the 8 to guide me.

Of the upper and lower side wall portions 12 and 13 of the pulley support frame 6, the upper side wall portion 12 has a long hole 15 for releasing the tension release rod 14.
The tension release rod 14 such as a screwdriver is supported from the long hole 15 for release operation by a pulley by attaching a mooring portion 16 of the tension release rod 14 to the lower side wall portion 13 while opening the tension release rod 14 along the tension direction 9. When it is inserted into the frame 6 and its tip is moored to the mooring portion 16 and the tension releasing rod 14 is moved along the releasing operation long hole 15 with the mooring portion 16 as a fulcrum, the tension pulley 5 is moved to the tension releasing rod 14. It is arranged so that it can move in the direction 25 opposite to the tension direction 9 against the tension spring 11 together with the pivot shaft 10 that contacts the peripheral side.

Therefore, compared with the case where the tension pulley 5 is directly put on the hand, a small operating force is required because the lever action of the tension release rod 14 can be used.
Since there is no room for accidental disengagement from the pivot shaft 10, no skill is required for the work, the work time can be shortened, and the moving operation of the tension pulley 5 can be easily performed in the work of removing the transmission belt 2.

Further, since it is only necessary to form the release operation long hole 15 and the mooring portion 16 on both upper and lower side wall portions 12 and 13 of the pulley support frame 6, it is not necessary to add new parts, and the structure is simple and inexpensive. Can be implemented.

The releasing operation long hole 15 has an engaging portion 28 of the tension releasing rod 14 which is oriented orthogonally to the end portion in the direction 25 opposite to the tension direction 9.
By forming the transmission belt 2, it is possible to remove the transmission belt 2 by releasing the hand from the tension release rod 14 while the transmission belt 2 is loosened, and to perform other work.

The mooring portion 16 is formed as a round hole to have a simpler structure.

[Brief description of drawings]

1 and 2 are views for explaining a spring pressure type tension device of a belt transmission device according to an embodiment of the present invention. FIG. 1 (A) is a front view of the tension device and FIG. 1 (B) is First
FIG. 1A is a sectional view taken along the line BB of FIG. 1A, FIG. 1C is a view in the direction of arrow C of FIG. 1A, and FIG. 2 is a front view of an engine equipped with a belt transmission. DESCRIPTION OF SYMBOLS 1 ... Belt transmission device, 2 ... Transmission belt, 3 ... Drive pulley, 4 ... Followed pulley, 5 ... Tension pulley, 6 ... Pulley support frame, 7 ... Side wall part of 6, 8 ... Pulley guide slot, 9
... Tension direction, 10 ... 5 pivot shaft, 11 ... Tension spring, 12 ... 6 upper side wall part, 13 ... 6 lower side wall part, 14 ... Tension release rod, 15 ... 14 release operation long hole, 16 … 14 moorings.

Claims (1)

[Scope of utility model registration request] 1. A transmission belt 2 of a belt transmission 1 is wound around a main driving pulley 3, a driven pulley 4 and a tension pulley 5, and a pulley guide slot 8 is formed in a side wall portion 7 of a pulley support frame 6 of the tension pulley 5 in a tension direction. Form along 9
In the spring pressure type tension device of the belt transmission device, which is configured such that the pivot shaft 10 of the tension pulley 5 is guided in the pulley guide elongated hole 8 and is elastically pressed in the tension direction 9 by the tension spring 11, the pulley support frame 6 Of the upper and lower side wall parts 12 and 13, one side wall part 12 has a long hole 15 for releasing the tension release rod 14.
And a mooring portion 16 of a tension release rod 14 on the other side wall portion 13 of the spring force type tension device of the belt transmission device.