JPS622055A - Adjusting device for belt tension in belt rotary power transmitting mechanism - Google Patents

Abstract

PURPOSE:To decrease a number of parts in the whole unit and form it in a compact size, by adjusting the position of a single idle shaft while tension of two belts. CONSTITUTION:An engine, in its low speed range, turns off an electromagnetic clutch 55 in an idle side while turns on an electromagnetic clutch 26 in a driven side. In this way, rotation of a crank pulley 20 is transmitted to an input shaft 22 of a compressor 21 through the first driving belt 59, the first and the second compressor pulleys 23, 25 and the electromagnetic clutch 26. When it is desired to adjust tension of the first driving belt 59, a nut 49 is loosened, and a device, if it handles an adjusting bolt 50 to be turned, vertically moves a movable block 48 along a guide long hole 41. In this way, the device, vertically displacing an idle shaft 45 and the first and second idle pulleys 51, 52, adjusts the tension of the first driving belt 59.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention provides two belts that can transmit the rotation of one drive pulley to a rotated shaft at different speeds, and also transfers the tension of the two belts to an idle state. This invention relates to a belt tension adjustment device for a belt rotation transmission mechanism that is adjusted by displacement of a pulley.

(Prior Art) Conventionally, as a belt rotation transmission mechanism, for example, the one shown in FIG.
The one shown in Figure 8 is known (June 1982).
(See Nissan Cedric Gloria Service Bulletin No. 484 published by August Jidosha Co., Ltd.), Figures 7 and 8.
The figure shows a belt rotation transmission mechanism that transmits the engine rotation of an automobile to the compressor of the Suzufusa device.8 This belt rotation transmission mechanism connects a crank pulley 3 to the crankshaft 2 of the engine 1 shown in FIG. Install the compressor pulley 6 to the input shaft 5 of the compressor 4 for cooling.
and connect crank pulley 3 to compressor boot IJ 6.
The drive belt 7 and the idler pulley 8 are used to interlock the drive belt 7 and the idler pulley 8. Furthermore, by adjusting the idle pulley 8 by moving it up and down as indicated by arrows 9 and 10, the tension of the drive belt 7 can be adjusted optimally.

In a vehicle equipped with such a belt rotation transmission mechanism,
This is because the compressor 4 rotates excessively in the high speed range of the engine 1, which is not very desirable.

In the high rotation range of the engine 1, it is desirable to reduce the rotation of the compressor 4 so that the compressor 4 does not rotate excessively. As a belt rotation transmission mechanism that satisfies this requirement, the one shown in FIGS. 9 and 10 can be considered.

Figure 9, iol! I, a first driven pulley 11 is rotatably mounted on the input shaft 5 of the compressor 4, and a second driven pulley 12 is fixed to the input shaft 5, and a first driven pulley 12 is fixed to the idle shaft 13. A second idler pulley 14.15 is rotatably mounted. Moreover.

The first idle pulley 14 is formed to have a larger diameter than the second idle pulley 15 and the first driven pulley 11, and the first driven pulley 11 is formed to have a smaller diameter than the second driven pulley 12.
The driven pulley 12 is formed to have a larger diameter than the second idler pulley 15. And the first. Second driven pulley 11,1
A driven side clutch (not shown) is interposed between the first and second clutches.
．． An idle side clutch (not shown) is interposed between the second idle pulleys 14 and 15. Further, the rank pulley 3 is interlocked with the first driven pulley 11 and the first idle pulley 14 via the first drive belt 16, and the second idle pulley 15 is interlocked with the second drive belt 17 and the third idle pulley 18. and is interlocked with the second driven pulley 12.

Moreover, the idle shaft 13 is provided so as to be rotatably adjustable about the input shaft 5, and the third idle pulley 18 is provided so as to be freely adjustable vertically in FIG. 9.

In the belt rotation transmission mechanism having such a configuration, when the belt rotation transmission mechanism is set to the first state (the driven side clutch is turned off and the idle side clutch is turned on), the rotation of the crankshaft 2 is transferred to the crank pulley 3° and the first drive belt. 16.
First idle pulley 14. Second drive belt 17. and is transmitted to the input shaft 5 of the compressor 4 via the second driven pulley 12. On the other hand, in the second state (driven side clutch is ON)
(with the idle side clutch turned OFF)
When the rotation of the crankshaft 2 is set to the crank pulley 3. First drive belt 16. First driven pulley 11. The signal is transmitted to the input shaft 5 of the compressor 4 via the driven clutch and the second driven pulley 12.

Therefore, in the low speed range of the engine 1, the compressor 4 rotates normally by being in the second state. on the other hand,
In the high speed range of the engine 1, the first state can prevent the compressor 4 from rotating excessively.

Furthermore, by rotating the idle shaft 13 around the input shaft 5, the tension of the first drive belt 16 can be adjusted, and by vertically adjusting the eighth idle pulley 18, the tension of the second drive belt 16 can be adjusted. The tension of the belt 17 can be adjusted.

(Problem to be solved by the invention) However, in such a configuration, the third idler
The space required increases by the amount of space provided. Therefore, it is desirable to be able to adjust the tension of the second drive belt 17 without providing such a third idle pulley 18.

Therefore, the present invention is characterized by providing a belt tension adjustment device for a belt rotation transmission mechanism that achieves this desire.

(Means for Solving the Problems) In order to achieve this object, the present invention includes a first driven pulley rotatably attached to a cylindrical portion through which the rotated shaft passes, and a second driven pulley attached to the rotated shaft. Fixedly, the first. A driven side clutch is interposed between the second driven pulley, the first and second idle pulleys are rotatably held by an idle shaft held by a stationary side member, and an idle clutch is provided between the first and second idle pulleys. Belt rotation in which a side clutch is interposed, the drive pulley is interlocked with the first idle pulley and the first driven pulley with a first drive belt, and the second idle pulley is interlocked with the second driven pulley with a second drive belt. Transmission mechanism belt tension adjustment
A shaft holding plate is attached to the fixed side member so as to be adjustable in advance and retreat with respect to either the rotated shaft or the driving pulley, and the idle shaft is attached to the shaft holding plate to connect the rotated shaft and the driving pulley. The belt tension adjustment device of the belt rotation transmission mechanism is characterized in that the idle shaft is held in a fixed side member in a position adjustable manner by attaching the idle shaft to the other side of the belt so as to be adjustable in forward and backward movement.

(Function) In such a configuration, the tension of the first drive belt or the second drive belt can be adjusted by adjusting the idle shaft to advance or retreat relative to the rotated shaft or the drive booth.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 6.

In Fig. 1, 19 is the engine crankshaft;
20 is a crank pulley (driving pulley) attached to the crankshaft 19, 21 is a compressor for the air conditioner, and Zl
22 is an input shaft (rotated shaft) that passes through the cylindrical portion 21a of the compressor 21. A first compressor pulley 23 as a driven pulley is rotatably mounted on the cylindrical portion 21a of the compressor 21 via a bearing 24, and a second compressor pulley 25 as a driven pulley is fixed to the input shaft 22. . The first compressor pulley 23 is the second compressor pulley 2
5 is formed to have a smaller diameter than the first one. An electromagnetic clutch 26 as a driven clutch is interposed between the second compressor pulleys 23 and 25. This electromagnetic clutch 26 includes a coil 27, an armature 28, and a leaf spring 29, and the coil 27 is fixed to a portion of the end surface of the compressor 21 facing the first compressor pulley 23. Further, the armature 28 and the leaf spring 29 are connected to the first. The leaf spring 29 is disposed between the second compressor pulleys 23 and 25, and the leaf spring 29 is disposed between the second compressor pulleys 23 and 25. It is arranged between the second compressor pulleys 23 and 25, one end of the leaf spring 29 is fixed to the side surface of the second compressor pulley 25, and the armature 28 is fixed to the other end of the leaf spring 29.

Further, in FIGS. 1 to 5, reference numeral 30 denotes a fixed mounting plate as a fixed side member. This fixed mounting plate 30 is fixed to an engine (not shown) via bolts 31 and spacer tubes 32 that pass through it. This fixed mounting plate 30
A rectangular hole 33 is formed in the center as shown in FIG.
A bent piece 34 facing the front side is integrally provided at one end of the fixed mounting plate 30. In Figure 0, 35 is a nut to be described later.6 36 is a shaft holding plate arranged on the front side of the fixed mounting plate 30. It is. Guide elongated holes 37 and 38 extending from left to right in FIG. 39 are integrally formed. Further, a bending piece 40 extending rearward is integrally formed at the upper end of the middle part of the shaft holding plate 36, and a guide elongated hole 41 facing the square hole 33 is formed upward and downward in the middle part of the shaft holding plate 36. ing.

Such a shaft holding plate 36 is fixed to the fixed mounting plate 30 with bolts 42 and 43 inserted through guide elongated holes 37 and 38, and a nut is attached to the tip of an adjustment bolt 44 that passes through bent pieces 39 and 34. 35 are screwed together.

45 is a cylindrical idle shaft, and one end of the idle shaft 45 is integrally provided with a flange 46. This idle shaft 45 is arranged in front of the shaft holding plate 36.

The fixing bolt 47 of the idle shaft 45 is inserted through the guide elongated hole 41 and also through a movable block 48 located in the square hole 33. And fixing bolt 47
A nut 49 is screwed onto the tip of the holder.

The above-mentioned idle shaft 45 has a first. Second idle pulleys 51 and 52 are rotatably held via bearings 53 and 54. This first idle pulley 51 is formed to have a larger diameter than the second idle pulley 52.
．． An electromagnetic clutch 55, which is an idle side clutch, is interposed between the second idle pulleys 51 and 52. This electromagnetic clutch 55 includes a coil 56, an armature 57, and a leaf spring 58, and the coil 56 is fixed to the flange 46. Further, the armature 57 and the leaf spring 58 are connected to the first.
It is disposed between the second idle pulleys 51 and 52, one end of the leaf spring 58 is fixed to the second idle pulley 52, and the armature 57 is fixed to the other end of the leaf spring 58.

The above-mentioned crank pulley 20 is interlocked with the first idle pulley 51 and the first compressor pulley 23 via the first drive belt 59, and the second idle pulley 52 is interlocked with the second compressor pulley via the 2nd i@ moving belt 60. It is linked to 25.

Next, the operation of the belt rotation transmission mechanism and belt tension adjustment device in such a configuration will be explained.

In the low speed rotation range of the engine, the idle side electromagnetic clutch 55 is turned off, and the coil 27 is energized to turn the driven side electromagnetic clutch 26 on.

As a result, the armature 28 resists the spring force of the leaf spring 29, and the first compressor pulley 23, 25 is integrally fixed. Therefore, the rotation of the crank pulley 20 is
Drive belt 59, first. 2nd compressor boo IJ23
, 25 and the compressor 21 via the electromagnetic clutch 26.
is transmitted to the input shaft 22 of.

On the other hand, in a high engine speed range, the coil 56 is energized to turn the idle side electromagnetic clutch 55 on and the driven side electromagnetic clutch 26 off. As a result, the armature 57 is magnetized and fixed to the side surface of the first idle pulley 51 against the spring force of the leaf spring 58, and
．． The second idle boob IJ51 and 52 are integrally fixed. Therefore, the rotation of the crank pulley 20 is caused by the rotation of the first drive belt 59. 1st. It is transmitted to the input shaft 22 via the second idle pulleys 51 and 52, the electromagnetic clutch 55, the second drive belt 60, and the second compressor pulley 25.

Furthermore, in the above-described configuration, when it is desired to adjust the tension of the first drive belt 59, first loosen the nut 49 so that the idle shaft 45 can move up and down.

Then, by rotating the adjustment bolt 50.

The movable block 48 is moved up and down along the guide elongated hole 41. This causes the idle shaft 45 and the first. The tension of the first drive belt 59 is adjusted by vertically displacing the second idle pulleys 51 and 52. Note that at this time, the tension of the second drive belt 60 also changes slightly, but the tension of the second drive belt 60
Since the distance between the input shaft 22 and the second idle pulley 52 supporting the input shaft 22 hardly changes, the tension of the second drive belt 60 hardly changes. After this kind of adjustment, Natsu 49
to fix the idle shaft 45 to the shaft holding plate 36.

Furthermore, when adjusting the tension of the second drive belt 60, first loosen the bolts 42, 43 to make the shaft holding plate 36 movable left and right in FIG. By rotating the nut 35 in this state, the shaft holding plate 36 is displaced leftward or rightward, and the first. 2nd idol boo IJ51
, 52 to the left or right. by this,
The tension of the second drive belt 60 is varied and adjusted. At this time, the tension of the first drive belt 59 also changes, but the amount of change is very small.

Therefore, in reality, first, the first rotation operation is performed by rotating the nut 35. When adjusting the tension of the second drive belt 59, 60,
After adjusting the tension of the second drive belt 60, the adjustment bolt 5
It is preferable to adjust the tension of the first drive belt 59 by a rotation operation of 0. After adjusting the tension of the second drive belt 60, the bolts 42 and 43 are tightened to fix the shaft holding plate 36 to the fixed mounting plate 30.

(Effects of the Invention) Since the present invention has the configuration as described above, by adjusting the position of one idle shaft, the first idle shaft. Second
The tension of the drive belt can be adjusted. As a result,
Since the number of pulleys for belt tension adjustment can be reduced,
The number of parts of the belt rotation transmission mechanism can be reduced, and the whole can be made more compact than before.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of a belt rotation transmission mechanism equipped with a belt tension adjustment device according to the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, FIG. 3 is a plan view of FIG. 2, and FIG. is ■ in Figure 3.
5 is a sectional view taken along the line v-■ in FIG. 1, FIG. 6 is a sectional view taken along the line VI-VI in FIG. 1,
FIG. 7 is a schematic explanatory diagram showing an example of a conventional belt rotation transmission mechanism, FIG. 8 is a plan view of FIG. 7, FIG. 9 is a schematic explanatory diagram showing an example of a belt rotation mechanism, and FIG. FIG. 20... Crank pulley (driving pulley) 21... Compressor 21a... Cylindrical portion 22... Input @ (rotated shaft) 23... First compressor pulley (first driven pulley)
25...Second compressor pulley (second driven pulley)
26... Electromagnetic clutch (driven side clutch) 30...
Fixed mounting plate (fixed side member) 35... Nut 36... Shaft holding plate 44...
- Adjustment bolt 48... Movable block 49... Nut 50... Adjustment bolt 51... First idle pulley 52... Second idle pulley 55... Electromagnetic clutch (idle side clutch) 59.
・・First drive belt 60・Second drive belt・Fig.
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Claims (1)

[Claims] A first driven pulley is rotatably attached to a cylindrical portion through which the rotated shaft passes, a second driven pulley is fixed to the rotated shaft, and a driven side clutch is interposed between the first and second driven pulleys, First and second idle pulleys are rotatably held on an idle shaft held by a fixed side member, an idle side clutch is interposed between the first and second idle pulleys, and a driving pulley is connected to the first idle pulley. and a belt tension adjustment device for a belt rotation transmission mechanism in which a first driven pulley is interlocked with a first drive belt, and a second idle pulley is interlocked with the second driven pulley through a second drive belt, the belt tension adjustment device comprising: a shaft holding plate; The fixed side member is attached to the fixed side member so that it can be adjusted forward and backward with respect to either one of the rotated shaft and the driving pulley, and the idle shaft is attached to the shaft holding plate so that it can be adjusted forward and backward with respect to the other of the rotated shaft and the driving pulley. 1. A belt tension adjustment device for a belt rotation transmission mechanism, characterized in that the idle shaft is held in a position-adjustable manner by being attached to the fixed side member.