JPS6224755Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device that automatically detects slack in an automobile fan belt and issues a warning.

[Prior Art] Conventionally, it has been common for the tension of automobile fan belts to loosen considerably several months after initial adjustment, which is unavoidable due to the material of the fan belt. For this reason, periodic tension checks are required and are always performed at the six-month inspection. However, in the initial stage, that is, when the fan belt is new, the fan belt elongates surprisingly much, and sometimes the belt continues to run with the belt slack, causing battery build-up due to insufficient filling of the alternator and wear due to idle rotation of the fan belt itself. Furthermore, if the fan belt becomes too loose, there is a risk that the fan belt may come off the pulley during engine startup, and if it comes off toward the engine, it may interfere with other parts and lead to an undesirable disaster.

In order to detect such loosening of the fan belt in advance and issue a warning, a
No. 35386 proposes a fan belt elongation warning device for an internal combustion engine. In the conventional proposal, a roller is rotatably supported at one end of a lever that swings about the center, the roller is pressed against the fan belt, and the other end of the lever is pulled by a tension spring, so that the spring is connected to the lever. A spring tension adjustment device fixed to the engine is installed at the end opposite to the connection to adjust the pressing force of the fan belt, and a limit switch is installed in the middle of the lever's swing so that the setting position relative to the lever can be adjusted. It was configured.

In the above conventional device, the pushing force of the fan belt of the roller is first adjusted by the tension spring tension adjustment device, the spring tension adjustment device is fixed at that position, and after the adjustment work is completed, the tension is adjusted properly. Forcibly bend the fan belt by applying a large force to the lever with a jig, etc., to the position where it would be bent if it were loosened further, and then adjust the position of the limit switch so that it is turned on at that forced slack position. It was supposed to be fixed.

[Problem that the invention attempts to solve]

However, with conventional fan belt slack detection and warning devices, although there were technical problems in issuing a warning when the fan belt became slack,
The following problems arose in the means of achieving this technical problem.

When adjusting and fixing the position of the limit switch, the fan belt is forcibly bent from its initial proper tension state to the slack side, giving the fan belt extra stretch from its initial state.

Adjusting the position of the limit switch and fixing it is done while forcibly bending the fan belt, so when a person does this, the force that bends the fan belt further than the proper tension position (this force usually exceeds human power) is required. It is difficult to adjust and fix the limit switch position because the operator has to perform parallel work that requires the assistance of a jig (requiring the aid of a jig), making it difficult to concentrate on the delicate work of adjusting the limit switch position.

Ha) Detecting loosening of the fan belt and setting the warning device requires two-step adjustment work: adjusting the tension spring and adjusting and fixing the limit switch, and the assembly work requires a two-step process. It is not suitable for assembly on an automobile parts assembly line where work is required to be simplified and shortened.

D. How much tensile load can be applied to the tension spring when tensioning the fan belt using the tension spring, because the tension spring is mediated by the swinging of the lever and because the tension spring does not extend perpendicular to the direction in which the fan belt is tensioned? It is difficult to intuitively determine whether the fan belt is tensioned at the proper tension, and it is difficult to obtain the proper initial tension. In other words, as is well known, the proper tension of the fan belt is determined by the fact that when a person pushes the fan belt with a manual pushing force (approximately 10 kg) in a direction perpendicular to the fan belt tensioning direction, the fan belt will tighten in the direction of the push. It is considered proper when the belt is bent by about 11mm to 13mm, but since this proper tension check and the way the load is applied are too different, the proper tension must be obtained by converting the tensile force of the tension spring. It is easy to make mistakes in setting the correct initial tension for the fan belt.

The above-mentioned problems are caused by the structure thereof, and an object of the present invention is to provide a fan belt slack sensing and warning device with a different structure that can solve the above-mentioned problems. In other words, the present invention enables (a) to set the fan belt slack detection and warning device without forcibly bending the fan belt further from the initial tensioned state, and (b) without requiring parallel work to bend the fan belt excessively. This simplifies the setting work, and it can be set with just one touch, which simplifies the setting work. It is an object of the present invention to provide a fan belt slack detection and warning device that can directly detect displacement in a direction perpendicular to the tensioning direction.

[Means for solving problems]

In order to achieve the above object, the fan belt slack detection and warning device according to the present invention has a U-shaped pressure roller holding device having a U-shaped shape smaller than the U-shaped inner side of the U-shaped U-shaped one. A bracket is provided, round holes are bored in both legs of the U-shaped bracket, a shaft is inserted into the round hole, and a pressure roller is supported on the shaft inside the U-shape of the U-shaped bracket. Elongated holes extending in the longitudinal direction of the U-shaped legs of the pressure roller holding device are formed so that both ends of the shaft that supports the pressure roller are slidably engaged, and the legs of the U-shaped bracket are slidably engaged. A compression coil spring is arranged between the bottom of the U-shaped bracket and the U-shaped bottom of the pressure roller holding device, and the bottom of the U-shaped bracket and the pressing roller are connected to either one of the U-shaped bracket and the pressure roller holding device. Install a switch connected to an electric circuit that includes a warning device that turns on when the distance between the roller holding device and the bottom reaches a set value, and when the switch is turned on, a current flows to issue a warning. A fan belt loosening detection device is constructed by pressing a pressing roller against a fan belt in a direction perpendicular to the direction in which the fan belt is stretched, and fixing the pressing roller holding device to the engine with the switch turned off. Consists of a warning device.

[Effect]

The device of the present invention can be set simply by pressing the pressure roller against the fan belt in the assembled state and fixing it to the engine in the switched off state, so the fan belt can only be tensioned to the appropriate tension state when setting. Therefore, since the fan belt is not forced to bend any further, it is possible to avoid excessive elongation of the fan belt.
In other words, when installing a device to detect fan belt slack, there is no need to apply a load to the fan belt that would increase the initial slack.
All you need to do is apply a load to the appropriate tension.

Therefore, when installing the slack detection warning device,
The force required to press the device onto the fan belt is within the load range of approximately 10 kg that can be easily achieved by a person, and does not involve concurrent work that requires a large load that would force the fan belt to bend excessively. Therefore, the setting work is not as difficult as in the past.

Furthermore, installation is a one-step process that involves pressing the pressure roller against the fan belt, turning off the switch, and then fixing the device to the engine, making it extremely easy to assemble on the vehicle and assemble on the line. It becomes possible to attach.

Furthermore, since the pressure on the fan belt is perpendicular to the direction in which the fan belt is stretched, and the deflection of the spring due to the reaction force of the fan belt is also perpendicular to the direction in which the fan belt is stretched, the pushing force and deflection of the fan belt can be intuitively and accurately determined. There is no need to convert the magnitude or direction of the load or force, and situations that could result in mistakes during installation can be avoided.

The above-mentioned functions and effects are extremely suitable for use as a fan belt slack detection and warning device for automobiles. By employing this device, the problems that conventional devices had are resolved.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a device according to a first embodiment of the present invention. In the figures, 1 is a fan belt, which is stretched between, for example, a crank pulley 2 and a pulley 3 of an air conditioner compressor. It has been passed. In the middle of the fan belt 1, and preferably in the middle of the slack side of the fan belt 1, there is a pressure roller holding having a U-shape (including a shape close to a U-shape if it is essentially a U-shape). A pressing roller 5 floatingly supported by the device 4 is provided so as to be pressed against the fan belt 1 from the inside to the outside (or from the outside to the inside) of the loop of the stretched fan belt 1. ing. The pressure roller holding device 4 is normally fixed to the engine body (not shown).

Both legs 4a, 4b of a U-shaped portion formed in a portion of the pressing roller holding device 4 corresponding to the fan belt 1
A long hole 6 is bored in the fan belt 1 and extends in a direction perpendicular to the direction of tension of the fan belt 1. By slidably inserting the shaft 7 of the pressure roller 5 into the long hole 6, the pressure roller 5 is rotated. It is supported in a floating manner so that it can move in a direction perpendicular to the direction in which the fan belt 1 is stretched. The ring 7 of the pressure roller 5 is provided on both legs 8a, 8b of a U-shaped bracket 8 having a U-shape smaller than the U-shape of the pressure roller holding device 4 (essentially a U-shape is sufficient). It is inserted through a circular hole, and when the pressure roller 5 moves, the U-shaped bracket 8
They are also beginning to move as one. A compression coil spring 9 is interposed between the bottom side 4c of the U-shaped portion of the pressing roller holding device 4 and the bottom side 8c of the U-shaped portion of the U-shaped bracket 8. The pressure roller 5 is urged through the fan belt 1 to constantly press the pressure roller 5 against the fan belt 1.

A switch 10 is attached to the bottom side 4c of the pressure roller holding device 4, and the switch 10 is electrically connected to a warning device 11. Warning device 1
1 is equipped with a battery 12 and warning means, such as an alarm buzzer 13, and forms a series circuit with the switch 10. The switch 10 includes a pressure roller 5,
The switch 10 is turned on when the U-shaped bracket 8 moves away from the switch 10 by a certain amount or more, and is turned off when pushed by the U-shaped bracket 8, so that the switch 10 is turned on. Current flows through the buzzer 13 at this time. Note that the warning means is not limited to the buzzer 13, but may be an indicator lamp provided in the passenger compartment of the automobile. In the assembled state as described above, press the pressing roller 5 against the fan belt 1 in a direction perpendicular to the direction in which the fan belt 1 is stretched.
With the switch 10 turned off, the pressure roller holding device 4 is fixed to the wall of the engine.

In the device having the above configuration, since the fan belt 1 is always under tension, the spring 9 is compressed and the switch 10 is pushed by the U-shaped bracket 8, and no current flows through the warning device 11. , therefore, the buzzer 13 does not issue an alarm. However, when the fan belt 1 is extended, the pressing roller 5 biased by the spring 9 is pressed against the fan belt 1.
It moves to the side to absorb the slack in the fan belt 1 and performs the function of a tensioner. When the pressure roller 5 moves by a certain amount or more, the U-shaped bracket 8 that moves together with the pressure roller 5 separates from the switch 10, the switch 10 is turned on, current flows through the warning device 11, and the buzzer 13 sounds. Further, when the warning means is a lamp instead of the buzzer 13, the indicator lamp is lit. This allows the driver to know that the fan belt 1 has been extended. However, even if the alarm buzzer 13 sounds, the pressure roller 5 acts as a tensioner and absorbs the slack in the fan belt 1, so it does not mean that there is an immediate danger, and if the tension of the fan belt 1 is adjusted at the appropriate time. good.

4 and 5 show an apparatus according to a second embodiment of the present invention. In this embodiment, the pressure roller in the first embodiment pushes the fan belt from the inside toward the outside, whereas the pressure roller pushes the fan belt from the outside toward the inside. Further, a rod 14 is attached to the U-shaped bracket 8 that moves together with the pressure roller 5, and the rod 14 extends outwardly through the bottom side 4c of the pressure roller holding device 4. A switch 15 of the type that turns on when pressed is attached to the part. The switch 15 is pressed by coming into contact with the bottom side 4c of the pressure roller holding device 4 when the pressure roller 5 has moved beyond a certain amount, and is thereby turned on and closes the electric circuit of the warning device, causing the alarm buzzer 13 to sound. It is designed to generate an alarm by passing an electric current through it. Since the other configurations are similar to the first embodiment, corresponding parts are given the same reference numerals as in FIGS. 1 to 3 and the description thereof will be omitted.

In the second embodiment having the above configuration, since the fan belt 1 is always under tension, the pressure roller 5 and the U-shaped bracket 8 compress the compression spring 9, and the switch 15 moves from the bottom side 4c. Since the bottom side 4c does not press the switch 15, the switch 15 is in an off state and the buzzer 13 does not sound. However, as the fan belt 1 extends, the pressure roller 5 urged by the spring 9 moves in a direction in which the switch 15 approaches the bottom side 4c, absorbing the slack in the fan belt 1. When the pressing roller 5 moves by a certain amount or more, the switch 15 comes into contact with the bottom side 4c and is pressed, turning on the switch 15 and sounding the buzzer 13 to inform the driver that the fan belt 1 has been extended.

In addition, in the description of the above embodiment, the fan belt 1 is taken as an example of a fan belt stretched between the crank pulley 2 and the pulley 3 of the air conditioner compressor, but the fan belt 1 is not limited to this. It may also be a fan belt for auxiliary machinery used in other automobiles.

When using the fan belt slack sensing device of the present invention, the following general effects can be obtained. That is, a floatingly supported pressing roller is pressed against the fan belt by a spring, and as the fan belt loosens, the pressing roller is moved, and a switch that is turned on is actuated in accordance with the movement, and the warning means is activated by the switch. For example, by making a buzzer sound, slackness of the fan belt can be detected early and automatically, and appropriate measures can be taken. Further, this loosening of the fan belt can be detected even while the vehicle is running, making it extremely safe.

Furthermore, since the pressing roller is biased by a spring, the slack of the fan belt itself can be absorbed to some extent. Therefore, even if a warning is issued due to slack in the fan belt, the spring's pressing force can prevent the belt from becoming untidy or coming off in the early stages of loosening, so the belt tension can be activated at the same time as the warning. There is no need to make any adjustments, and the effect is that you can deal with the situation with leeway. This effect is particularly effective when the fan belt cannot be re-tensioned immediately, such as when driving on a highway or when there is an emergency.

Furthermore, when the present invention is used, the following unique effects can be obtained compared to conventional devices.

The device of the present invention can be set simply by pressing the pressure roller against the fan belt in the assembled state and fixing it to the engine in the switched off state, so the fan belt can only be tensioned to the appropriate tension state when setting. Therefore, since the fan belt is not forced to bend any further, it is possible to avoid excessive elongation of the fan belt.
In other words, when installing a device to detect fan belt slack, there is no need to apply a load to the fan belt that would increase the initial slack.
All you need to do is apply a load that is equal to the appropriate tension.

Therefore, when installing the slack detection warning device,
The force required to press the device onto the fan belt is within the load range of approximately 10 kg that can be easily achieved by a person, and the setting work is similar to that of the conventional method since it does not involve the concurrent work of forcibly bending the fan belt. It does not involve such difficulties.

Furthermore, installation is a one-step process that involves pressing the pressure roller against the fan belt, turning off the switch, and then fixing the device to the engine, making it extremely easy to assemble on the vehicle and assemble on the line. It becomes possible to attach.

Furthermore, the pressure on the fan belt is perpendicular to the fan belt tensioning direction, and the deflection of the spring due to the reaction force of the fan belt is also perpendicular to the fan belt tensioning direction, so the push and deflection of the fan belt can be intuitively and correctly understood. This eliminates the need to convert the magnitude and direction of loads and forces, and avoids situations where errors occur during installation.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view of the fan belt slack sensing device of the present invention applied to the fan belt between the crank pulley and the air conditioner compressor pulley, and Fig. 2 is an electrical diagram of the device according to the first embodiment of the present invention. 3 is a side view of the device of FIG. 2; FIG. 4 is a front view with an electrical circuit diagram of the device according to the second embodiment of the present invention; FIG. The figure is a side view of the apparatus of FIG. 4. DESCRIPTION OF SYMBOLS 1... Fan belt, 4... Pressing roller holding device, 5... Pressing roller, 8... U-shaped bracket, 9... Compression spring, 10... Switch,
11...warning device, 13...buzzer, 15...switch.

Claims (1)

[Scope of utility model registration request] A bracket having a U-shape smaller than the U-shape is arranged inside the U-shape of the pressing roller holding device having a U-shape, and round holes are bored in both legs of the U-shape bracket. A shaft is inserted into the round hole, and a pressure roller is supported on the shaft inside the U-shape of the U-shaped bracket, and a pressure roller is provided on both U-shaped legs of the pressure roller holding device and extends in the longitudinal direction of the legs. A long hole is formed to slidably engage both ends of the shaft supporting the pressure roller, and between the U-shaped bottom of the U-shaped bracket and the U-shaped bottom of the pressure roller holding device. A compression coil spring is installed on either the U-shaped bracket or the pressure roller holding device, and turns on when the distance between the bottom of the U-shaped bracket and the bottom of the pressure roller holding device exceeds a set value. Attach a switch connected to an electric circuit that includes a warning device that generates a warning by causing current to flow when the switch is turned on. With the switch assembled as described above, move the pressure roller to the fan belt in the direction in which the fan belt is stretched. A fan belt loosening sensing and warning device is constructed by fixing the pressing roller holding device to the engine in a state where the switch is turned off by pressing it in a direction perpendicular to the fan belt.