JPH0656545U - Belt tension detection mechanism in belt transmission device - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a belt tension detecting mechanism in a belt transmission device capable of accurately measuring the amount of bending of the belt according to a predetermined maintenance standard without removing the cover body. [Structure] On the belt transmission device A side, an inspection hole 5 is provided at a predetermined position of the cover body 4 located substantially in the center of the tensioned position of the belt 3, while on the detection jig B side, the tip end portion is the peripheral surface of the belt 3. A straight rod-shaped insertion portion 11 that is inserted through the inspection hole 5 so that it can be pressed, and the insertion portion 11 in a state in which a biasing force is applied in a direction that opposes the pressing direction of the insertion portion 11. The grip portion 13 axially displaceably fitted to the rear end side of the belt, the insertion portion 11 is inserted through the inspection hole 5, and the tip end of the grip portion 13 is pressed against the peripheral surface of the belt 3. In this state, the grip portion 13 is pressed in the pushing direction of the belt 3, and the reading portion 17 capable of reading the belt pressing load by the displacement amount thereof and the insertion displacement amount of the insertion portion 11 from the belt pressing position. , 19 points

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a belt tension detecting mechanism in a belt transmission device in which a sprocket and a chain belt mechanism or a pulley / belt mechanism is covered with a cover.

[0002]

[Prior art]

 Conventionally, for example, in a bus or other heavy-duty vehicle, a transmission is placed laterally at a position rearward of the vehicle at a right angle to the traveling direction of the vehicle, and the output from the transmission is composed of a transverse gearbox, a sprocket and a chain belt. It is configured to be able to differentially transmit power via a belt mechanism and a propulsion shaft.

This type of belt mechanism causes bending (loosening) of the chain belt due to long-term use or sand biting during vehicle running, and when the slack occurs, the chain jumps, and at worst, the chain belt comes off. And so on. For this reason, the Vehicle Maintenance Standards instruct that the belt tension should be inspected regularly, but there is no dedicated inspection jig for such belt tension inspection. A straight rod is pressed against the center of the chain belt stretched between a pair of sprockets axially mounted on the driven shafts with a pressing load of about 10 Kgf / cm ² , and the amount of bending of the chain belt at the time of pressing is detected. I was judging the quality.

[0004]

[Problems to be solved by the device]

 However, in the actual belt mechanism, the sprocket and the cover body that covers the entire surface of the belt are provided for safety and to prevent sand stones from colliding or being caught from the outside. For this reason, in order to inspect the tension, the inspection cannot be performed unless the cover body is removed, and due to the arrangement configuration of the transmission mechanism of the vehicle, the cover body and a part of the transmission side housing are also removed. It had to be done and the inspection work was extremely complicated. In addition, since the inspection method is an extremely qualitative inspection method of pressing the central portion of the belt with a straight rod, the skill level is required and the measurement is likely to vary.

In view of the drawbacks of the prior art, the present invention provides a belt tension detecting mechanism in a belt transmission device capable of accurately measuring the amount of bending of the belt according to a predetermined maintenance standard without removing the cover body. With the goal.

[0006]

[Means for solving the problem]

 In view of the above technical problems, the present invention provides a belt tension detecting mechanism in a belt transmission device in which the periphery of the belt mechanism is covered with a cover body. The inspection hole 5 is provided at a predetermined position of the cover body 4 located in the above position. In this case, the inspection hole 5 may be openable only when in use, and the lid body 6 or the like may be screwed. On the other hand, on the detection jig B side, the tip end opposes the straight rod-shaped insertion portion 11 which is inserted through the inspection hole 5 so that the peripheral surface of the belt 3 can be pressed, and the pressing direction of the insertion portion 11. In the state where the urging force is urged in the direction, the rear end side of the insertion portion 11 is constituted by a grip portion 13 which is displaceably fitted in the axial direction. In this case, the urging force is generally a spring. It is configured by the member 15 or by using pneumatic force. Then, the insertion portion 11 is inserted from the inspection hole 5, and the grip portion 13 is pressed in the pressing direction of the belt 3 with the tip end of the insertion portion 11 pressed against the peripheral surface of the belt 3, and the belt pressing is performed by the displacement amount. A belt tension detecting mechanism is proposed, which has an essential requirement that it is provided with reading portions 17 and 19 capable of reading the load and the insertion displacement amount of the insertion portion 11 from the belt pressing position.

In this case, the reading sections 17 and 19 may be scales engraved on the insertion section 11, as shown in the embodiment described later, or a dial gauge formed by a rack and gear mechanism, or a capacitance. A digital scale for reading changes in Further, these reading units 17 and 19 may be provided at remote locations.

[0008]

[Action]

 According to such a technical means, even if the cover body 4 is not removed, the insertion portion 11 is inserted from the inspection hole 5 of the cover body 4, and the tip portion of the insertion portion 11 is pressed against the peripheral surface of the belt 3, Further, simply by pressing the grip portion 13 in the pressing direction of the belt 3, the belt pressing load is caused by the displacement amount of the grip portion 13, and the insertion displacement amount from the belt pressing position of the inserting portion 11, in other words, the belt. The amount of bending can be detected.

As a result, the belt flexure amount based on the maintenance standard at a predetermined position and a predetermined pressure can be inspected accurately and reliably. Moreover, since the above inspection does not require removal of the cover body 4 and only needs to press the belt 3 from the inspection hole 5 by the grip portion 13, the inspection work is extremely simplified.

[0010]

【Example】

 Hereinafter, embodiments of the present invention will be illustratively described in detail with reference to the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are not intended to limit the scope of the present invention to them, but are simple. It is only an example. FIG. 2 shows a belt transmission device A according to an embodiment of the present invention. For example, a drive shaft 7 on the transmission side and a driven shaft 8 on the propulsion shaft are integrally provided with sprockets 1 and 2 via keys (not shown). Along with the shaft, an endless chain belt 3 is stretched between the sprockets 1 and 2. Then, an oblong cover body 4 is attached so as to cover the sprocket 1, 2 / belt 3 and the blind cover 9 is screwed into the cover body 4 at approximately the center of the belt tension position. Insert / screw 5.

FIG. 1 shows a detection jig B, which is a main part of the present invention, and has a straight rod-shaped insertion portion 11 whose tip portion is inserted from the inspection hole 5 so that the peripheral surface of the belt 3 can be pressed against the insertion portion 11. A tubular accommodating portion 11a having an upper end opened via a flange 12 is provided at a portion of the insertion portion 11 projecting outside the cover body 4, and the lower end is opened after accommodating the coil spring 15 in the accommodating portion 11a. The tubular grip 13 is fitted so as to be slidable in the axial direction. Then, a scale 17 is engraved near the insertion position of the inspection hole 5 of the insertion portion 11, and when the grip portion 13 is pressed in the pressing direction of the belt 3, the insertion portion 11 is inserted from the belt pressing position. The displacement amount is formed so as to be detectable in relation to the surface of the cover body 4, and a load scale 19 for measuring the displacement amount of the pressing load is engraved on the outer circumference of the tubular storage portion below the grip portion 13.

According to this embodiment, the blind lid 9 is usually screwed on the inspection hole 5 to prevent sand stones or the like from entering through the inspection hole 5. Then, at the time of inspection and inspection, after the blind lid 9 is removed, the insertion portion 11 of the detection jig B is inserted through the inspection hole 5 and the tip portion thereof is pressed against the circumferential surface of the belt 3. Read the initial scale of the scale 17 engraved on the insertion portion 11 in the unloaded state at the time when it coincides with the surface of the cover body 4, and further apply the grip portion 13 to the elastic force of the coil spring 6 in the pressing direction of the belt 3. Press against it.

Then, the load scale 19 causes the belt pressing load of the grip portion 13 to coincide with the surface of the cover body 4 of the insertion portion 11 at the time when the belt pressing load reaches a load defined by the maintenance standard, for example, 10 Kgf / cm ^2. The scale 17 at that time is read, and the amount of insertion displacement from the belt pressing position is grasped based on the difference from the initial scale.

As a result, the belt flexure amount t 1 based on the maintenance standard at a predetermined position and a predetermined pressure can be inspected accurately and reliably, and the above-mentioned operation is satisfied.

[0015]

[Effect] According to the belt tension detecting mechanism, the amount of flexure of the belt can be accurately measured by a predetermined inspection standard with a simple inspection jig without removing the cover body. It has various remarkable effects.

[Brief description of drawings]

FIG. 1 is an enlarged view of an essential part showing a detecting jig and a cover body which are essential parts of the present invention and a detecting operation thereof.

FIG. 2 is a schematic view showing a belt transmission device according to an embodiment of the present invention.

[Explanation of symbols]

 1, 2 Sprocket 3 Belt (chain) 4 Cover body 5 Inspection hole B Detection jig 11 Straight bar-shaped insertion part 13 Grip part 17, 19 Reading part

Claims (1)

[Scope of utility model registration request] 1. A belt tension detecting mechanism in a belt transmission device comprising a cover body surrounding a pulley / belt mechanism or a sprocket / chain belt mechanism, wherein the cover is located substantially at the center of the belt tension position. An inspection hole is provided at a predetermined position on the body, and in the detection jig, a straight rod-shaped insertion portion is inserted through the inspection hole so that the tip of the detection jig can press the belt peripheral surface, and the pressing direction of the insertion portion. The grip portion is fitted to the rear end side of the insertion portion so as to be displaceable in the axial direction in a state in which a biasing force is applied in the direction against the insertion portion, and the insertion portion is inserted from the inspection hole. Then, with the tip end pressed against the belt peripheral surface, press the grip part in the belt pressing direction, the belt pressing load depends on the displacement amount, and the insertion displacement from the belt pressing position of the insertion part. Readable quantity Belt tension detection mechanism characterized by having a reading unit