JPH0439486Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention applies to drive belts for various devices such as hydraulic pumps in automobiles, such as belt-driven alternators (generators), air conditioners, and power steering. The present invention relates to a belt tensioning device, and particularly to a belt tensioning device that corrects the elongation of a drive belt and easily adjusts the tension to an appropriate tension.

[Conventional technology]

A specific example of a belt drive device installed in an automobile engine as a conventionally used belt tensioning device will be explained based on an example of an engine alternator A shown in FIGS. 6 to 9. A pulley C is fixed to the end of the drive shaft B, and a belt D is stretched around the pulley C.
It is designed to be driven by

The lower part of the frame of the alternator A is rotatably attached to the engine frame of the automobile by a fixed shaft E, and the upper part thereof is provided with an alternator tightening flange F, and the alternator tightening flange F is connected to an adjuster bar. 1 via a stud 6 so as to be movable.
As shown in FIG. 7, this moving mechanism includes a slide nut 2 provided on a stud 6 provided on the alternator tightening flange F, which is fixed to the adjustment bar 1 with a nut ₆₁ , and an adjustment bolt 4 is screwed into the slide nut 2. In addition, the adjusting bolt 4 has a flange portion 3 that is compressed by the adjusting bolt 4 when the belt D is tensioned by contacting the claw portion 5 of the adjusting bar 1 with the flange portion 3. Force is now being applied to the state of being exposed.

When the belt D stretches during use of the device and it becomes necessary to adjust its tension,
When the stud 6 is loosened and the adjustment bolt 4 is rotated, the alternator tightening flange F is moved along the long hole 8 formed in the adjustment bar 1, and the alternator A is rotated around the axis E.
This allows the tension of the belt 3 to be adjusted, and after the adjustment is completed, the nut ₆₁ of the stud 6 is tightened to fix the alternator tightening flange F to the adjuster bar 1.

[Problem that the invention attempts to solve]

However, in the case of such a conventionally used belt tensioning device, as described above, when tensioning the belt D, the nut ₆₁ of the stud 6 is loosened, the adjusting bolt 4 is turned, and the alternator A is moved to the seventh position. When it is moved in the direction of the arrow in the figure, there is a play between the stud 6 and the slide nut 2, and a play between the slide nut 2 and the adjusting bolt 4, as shown in Fig. 9A.
If the nut is tightened under this condition, the adjustment bolt 4 will be bent as shown in Figure 9B, making it impossible to readjust it. When tightening is performed by a screwdriver, there are many problems such as damage to the adjuster bolt due to the high vibration and impact.

[Problem that the invention attempts to solve]

The present invention is intended to eliminate the drawbacks of the above-mentioned conventional belt tensioning devices, and provides a structure to prevent the belt tension adjusting bolt from deviating from its center axis to maintain the function of the adjusting bolt normally, making it safe to handle and allowing for high speed and high-speed use in factories using nut runners.
To provide a device capable of adjusting belt tension without damaging an adjustment bolt even during fastening work under high vibration conditions.

[Means and effects for solving the problem] The present invention provides an adjustment bolt in which a slide nut 2 is movably provided in the elongated hole 8 of an adjustment bar 1 via a stud 6, and the slide nut 2 has a flange 3. 4 are screwed together, and the adjustment bolt 4 is rotated by being locked and supported by the fork-shaped pawl portion 5 bent and formed on the adjustment bar 1 via the flange portion 3 of the adjustment bolt 4. , in a device having a structure in which the entire device is oscillated around a fixed shaft, thereby adjusting the tension of the device driving belt, when compressive force is applied to the azimuth cast bolt 4, the azimuth The flange 3 is arranged so that the center axis of the bolt 4 between the screwing axis of the slide nut 2 and the locking position of the forked claw 5 does not deviate.
This belt tensioning device is characterized in that the and the claw portion 5 form a locking structure.

〔Example〕

The configuration of the belt tensioning device of the present invention will be explained according to the illustrated embodiment. As shown in FIGS. 1 and 2, in the belt tensioning device of the present invention, the alternator tightening flange 7 of the alternator A is is provided with a stud 6, which is movably attached to the elongated hole 8 of the adjuster bar 1 via the stud ₆ , so that the slide nut 2 can be tightened and fixed with the nut 61. They are screwed together with the bolt 4 passing through them.

This adjusting bolt 4 is an adjusting bolt having a flange portion 3, and is supported by being engaged with a bifurcated claw portion 5 formed by bending the adjusting bar 1 via the flange portion 3. When compressive force is applied to the adjusting bolt 4, the flange portion 3 and the claw portion 5 are connected so that the center axis of the bolt 4 between the threaded shaft of the slide nut 2 and the locking position of the claw portion 5 does not deviate. It has a supporting structure.

In the illustrated example, the flange 3 has an outer periphery that can come into contact with the bent piece 5 ₁ formed on the claw 5 without a gap, and even when force is applied to the adjuster bolt 4, the screw center shaft is I've made sure that doesn't happen.

In the figure, 9 is a pulley, 10 is a belt, 11 is an engine, 12 is a crank pulley, 13 is a cooler,
14 is a mounting screw, 15 is a mounting piece, and 16 is a pivot shaft.

In the specific example shown in FIG. 3, the claw portion 5 is bent at an acute angle with respect to the adjustment bar 1, and the adjustment bolt 4 to be inserted is inclined at an angle θ so that the adjustment bolt 4 is brought closer to the adjustment bar 1 side. However, even if the bending angle is set at a right angle, a slope may be formed as the claw portion 5 that gradually increases in the thickness direction to prevent the adjusting bolt 4 from deviating from the center axis.

In the example shown in FIG. 4, the flange portion 3 has a contact surface with the claw portion 5 that is a spherical surface ₃₁ or a conical surface, and the bolt insertion notch groove 5 in the claw portion 5
₂ and is in a form that prevents it from coming off from the bolt axis, so that when compressive force is applied to the adjusting bolt 4, it slides in the direction of the arrow in Fig. 3 and stops at the _2nd end of the notched groove 5. I'm getting used to it, but
The claw portion 5 may be formed with a dish-shaped recess 53 into which the collar portion ₃ is fitted into a cutout groove ₅₂ into which the adjuster bolt 4 is inserted, thereby achieving an effect of preventing center shift. That is, even if a force is generated on the bolt 4 in a horizontal direction perpendicular to the bolt axis, the bolt 4 is prevented from being deviated from the center.

In the example shown in FIG. 5, a circular recess 54 into which the collar 3 of the adjuster bolt 4 fits into the claw ₅ of the adjuster bar ₁ is formed as a step at the end of the notch groove 52, and the adjuster bolt 4 is compressed. The collar portion 3 and the claw portion 5 have a locking structure so that the bolt 4 does not deviate from its center axis when force is applied.

In addition, in the embodiment of the present invention described above, the explanation was given as a device for adjusting the tension of a drive belt when driving a generator (alternator) of an automobile, but the present invention is applicable to the embodiment as described above. In addition to being used as a tension adjustment device for the drive belt of an air conditioner as described above or the drive belt of a hydraulic power generating device such as a power steering, the application is not limited to the case where it is applied to other belt drives. It can be used as a member for adjusting the belt of the device.

[Effect of idea]

Since the belt tensioning device of the present invention has the above-mentioned configuration, the adjustment bolt has a structure that prevents it from sliding sideways with respect to the adjustment bar, thereby eliminating the drawbacks of the conventional method and preventing damage to the adjustment bolt. It is safe to handle, and it is possible to easily and reliably set the appropriate tension on the belt, which makes it possible to extend the life of the belt.
It is possible to reduce the occurrence of accidents such as damage to the pulley bearing.

In addition, the belt tensioning device of the present invention can be easily addressed by changing some of the components of conventionally used belt tensioning devices, and can be provided at low cost. It is possible to adjust the belt tension without damaging the adjustment screw even when tightening work is performed at high speed and under high vibration conditions using nut runners in factories.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of the present invention in use, Fig. 2 is a plan view of the main parts, Fig. 3 is a plan view of a part of another embodiment, and Fig. 4 is a further embodiment. FIG. 5 is a cutaway front view of another embodiment, FIG. 6 is a side view of the conventional method, FIG. 7 is a plan view thereof, FIG. 8 is a slope view thereof, and FIG. 9A and 9B are partial plan views showing the operating state thereof. A... Alternator, 1... Adjustment bar,
2... Slide nut, 3... Flange, 4... Adjustment bolt, 5... Claw, 5 ₁ ... Bent piece, 5 ₂
...Notch groove, 5 ₃ , 5 ₄ ... recess, 6 ... stud, 6 ₁ ... nut, 7 ... alternator tightening slang, 8 ... long hole.

Claims (1)

[Claims for Utility Model Registration] (1) A slide nut 2 is movably provided in the long hole 8 of the adjustment bar 1 via a stud 6, and an adjustment bolt 4 having a flange 3 is screwed into the slide nut 2. , and a device that adjusts the tension of the belt by locking and supporting the fork-shaped pawl portion 5 bent and formed on the adjuster bar 1 via the flange portion 3 of the adjuster bolt 4. When compressive force is applied to the adjusting bolt 4, the center axis between the threaded shaft of the slide nut 2 and the locking position of the forked pawl 5 is not deviated. A belt tensioning device characterized by having a supporting structure. (2) The locking structure is configured such that the collar portion 3 has an outer periphery that can abut the bent piece 51 formed on the claw portion ₅ without any gap.Claim 1 of the Utility Model Registration Claim: Belt tensioning device as described in section. (3) The locking structure is such that the collar portion 3 has a spherical or conical surface that comes in contact with the claw 5, and is fitted into the dish-shaped recess ₅₃ of the claw portion 5. A belt tensioning device according to claim 1 of a certain utility model registration. (4) In the locking structure, the claw portion 5 is a forked claw portion with a notched groove ₅₂ into which the adjusting bolt 4 is inserted, and a circular recess ₅₄ into which the collar portion 3 is inserted. A belt tensioning device according to claim 1, which is constructed as follows. (5) The locking structure is such that the claw portion 5 is bent at an acute angle with respect to the adjusting bar 1, and is formed into a slope that draws the inserted adjusting bolt 4 toward the adjusting bar 1 side. A belt tensioning device according to claim 1 of the utility model registration claim.