JPH0743514Y2 - Belt tension adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention adjusts the tension of a belt or the like used to drive an auxiliary machine such as a hydraulic pump for power steering or a compressor for car cooler by a running engine of an automobile. The present invention relates to a tension adjusting device suitable for

(Prior Art) An example of a conventional belt tension adjusting device is shown in FIG. 4 and FIG.

In FIGS. 4 and 5, 01 is a belt, and 02 is a tension pulley, which is rotatably supported by the tip of a shaft 03 via a bearing 04. The shaft 03 penetrates a long hole 06 formed in the bracket 05, and its base end is planted in the arm 07.
The base end of the arm 07 has a slit 08 formed in the bracket 05.
It is slidably fitted in and has a bracket 05
The tip of a bolt 09 that passes through is screwed.

Then, in order to increase the tension of the belt 01, the bolt 09 is rotated and the arm 07 is moved up to raise the tension pulley 02.

(Problems to be solved by the invention) The above-mentioned conventional device has a large number of parts, is complicated in structure, is expensive, and is large in size. Therefore, it is difficult to install in a narrow installation space such as an engine room, and tension There was a problem that adjustment work was difficult.

The present invention is provided in view of the above, and an object thereof is to have a small number of parts, a simple structure, inexpensive manufacturing, easy installation in a narrow installation space, and a narrow space. An object of the present invention is to provide a tension adjusting device that can easily perform the tension adjusting work in a space.

Further, another object of the present invention is to prevent the belts of different lengths from being erroneously assembled by restricting the swinging range of the bracket.

(Means for Solving the Problems) The present invention has been proposed in order to achieve the above object. The gist of the present invention is to rotatably support a tension pulley and to fix the base end portion to the above tension. By supporting the pedestal with bolts that are parallel to the rotation axis of the pulley,
When the bolt is loosened, it can be rotated about the pedestal with respect to the pedestal, and when the bolt is fastened, a bracket fixed to the pedestal is provided, and the abutment surface where the bracket and the pedestal come into contact with each other. A belt having an arc-shaped recess centered on the axial center of the bolt in one of the two, and a pin having a tip fitted in the recess is planted in the other of the contact surfaces. It is in the tension adjusting device.

(Operation) Since the present invention has the above configuration, the tension of the belt is adjusted by swinging the bracket around the bolt with the bolt slightly loosened. The tip of the pin moves in the arc-shaped groove along with the swing of the bracket, but when the end of the pin is reached, the swing of the bracket is stopped thereafter.

(Embodiment) One embodiment of the present invention is shown in FIGS.

A belt 1 is stretched over a tension pulley 2, a drive pulley 4 fixed to a crankshaft 3 of an engine, and a driven pulley 6 fixed to an input shaft 5 of a hydraulic pump for power steering. Reference numeral 7 is a bracket that rotatably supports the tension pulley 2, and its base end is fastened to a pedestal 10 protruding from the engine block by a bolt 9 parallel to the rotation shaft 8 of the tension pulley 2. At the tip of the bracket 7, a groove 12 into which the tip of the escension bar 11 is fitted and a parallel surface 13 sandwiched by a monkey spanner are formed.

As shown in FIG. 2 and FIG. 3, the abutment surface 15 of the bracket 7 to the pedestal 10 is provided with a circular recess 16 concentric with the through hole 17 of the bolt 9, and the bolt 9 A concave groove 18 having a predetermined length is formed in an arc shape centered on the shaft core 9a. Further, a pin 20 having a tip fitted into the groove 18 is planted on the contact surface 19 of the pedestal 10 to the bracket 7.

When the tension of the belt 1 is increased, the tip of the escape tension bar 11 is fitted into the groove 12 with the bolt 9 slightly loosened, or the parallel surface 13 is formed by a pair of engaging teeth of the monkey wrench. 1, and pulling these tools in the direction shown by the arrow in FIG. 1 swings the bracket 7 around the bolt 9, and when the tension of the belt 1 reaches a predetermined value, the bolt 9 is screwed in again. The base end of the bracket 7 is fastened to the base 10 so that it cannot rotate.

When the tension of the belt 1 is reduced, the tool may be pulled in the opposite direction to the above.

Swing the bracket 7 around the bolt 9
The tip of 20 moves in the arc-shaped groove 18, but when it reaches the end of the groove 18, the swing of the bracket 7 is stopped thereafter.

In the above embodiment, the recessed groove 18 is formed in the contact surface 15 of the bracket 7 with respect to the pedestal 10, and the pin 20 is planted in the contact surface 19 of the pedestal 10 with respect to the bracket 7. The pin 20 may be implanted in the surface 15 and the concave groove 18 may be formed in the contact surface 19.

(Effect of the Invention) In the present invention, since the base end of the bracket that rotatably supports the tension pulley is fastened to the pedestal by the bolt, the structure is simple, the manufacturing is inexpensive, and the installation is easy even in a narrow installation space. In addition, the tension can be easily adjusted in a narrow space.

In addition, an arc-shaped groove centered on the axis of the bolt is formed in one of the contact surfaces where the bracket and the pedestal contact each other, and a pin whose tip fits in the groove is formed in the other surface. Since it is planted, the swing range of the bracket can be restricted, and therefore, belts having different lengths can be prevented from being erroneously assembled.

[Brief description of drawings]

1 to 3 show one embodiment of the present invention, FIG. 1 is a side view, FIG. 2 is a sectional view taken along line II-II of FIG. 3, and FIG. 3 is III of FIG. FIG. 3 is a partial cross-sectional view taken along the line III.
4 and 5 show an example of a conventional device. FIG. 4 is a side view taken along the line IV-IV in FIG. 5, and FIG. 5 is a line V- in FIG.
It is sectional drawing which follows the V line. Tension pulley …… 2, bracket …… 7, bolt…
… 9, Pedestal …… 10, Groove …… 18, Pin …… 20

Claims (1)

[Scope of utility model registration request] 1. A tension pulley is rotatably supported, and a base end portion of the tension pulley is supported on a pedestal by a bolt parallel to a rotation axis of the tension pulley. When the bolt is loosened, the bolt is attached to the pedestal. While being rotatable as a fulcrum, a bracket that is fixed to the pedestal when the bolt is fastened is provided, and the shaft center of the bolt is centered on one of the contact surfaces where the bracket and the pedestal contact. A belt tension adjusting device characterized in that an arc-shaped concave portion is provided, and a pin whose tip is fitted in the concave portion is planted in either of the other contact surfaces.