JPS6367432A - Air-cooled doughnut-shaped elastic coupling - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an elastic joint that is used with an air clutch or the like to transmit power from a driving shaft to a driven shaft, and which is an air-cooled donut having an air-cooled structure. Regarding shaped elastic joints.

<Prior Art> Conventionally, as a shaft coupling device that uses both an air clutch and a doughnut-shaped elastic coupling, the one shown in FIG. 6 is known. This shaft coupling device incorporates a doughnut-shaped elastic coupling 31 inside an air clutch 30 in order to shorten the axial length and utilize space. The air clutch 30 includes a frame holder 33 coaxially fixed to the end of the ζ drive shaft 32, and a rim 3 attached to the frame holder.
4, an annular rubber tube 35 attached to the inner periphery of this rim, and a friction shoe 36 that is divided and fixed to the inner periphery of this rubber duplex. It consists of an inner ring 38 coaxially fixed to the inner ring, an annular vibration isolating rubber 39 whose inner periphery is vulcanized and bonded to the outer periphery of this inner ring, and an outer ring drum 40 whose outer periphery of this vibration isolating rubber is vulcanized and bonded to the inner periphery. . Friction no. 3 of the rubber duplex 35 expands and contracts in the radial direction with compressed air supplied and discharged through the drive shaft center and the air pipe 11.
6 is pressed onto or separated from the outer drum 40 from the outside, and the frictional force accompanying the pressing causes power to be transmitted or cut off from the drive shaft 32 to the driven shaft 37.

<Problems to be Solved by the Invention> Now, if the air clutch 30 is frequently engaged/disengaged or slowly engaged in the above-mentioned shaft coupling device, the friction shoe 36 and the outer drum 40 may repeatedly press against each other or slip against each other for a long period of time. A large amount of frictional heat is generated. Furthermore, if the air pressure decreases due to a failure in the air source or air pipe 41 during power transmission, the friction shoe 36 and the outer drum 40 become half-clutched, and a large amount of frictional heat is also generated.

Since the friction shoe 36 is usually made of a heat insulating material such as a resin mold, a large amount of frictional heat is transferred to the donut-shaped elastic joint 31 of the outer drum 40.

However, since the conventional donut-shaped elastic joint 31 described above has a structure in which vibration isolating rubber 39 is simply vulcanized and bonded between the inner and outer rings 38 and 40, a large amount of frictional heat transmitted to the outer ring drum 40 is absorbed. This is transmitted to the vibration isolating rubber 39, causing the vibration isolating rubber to deteriorate due to thermal decomposition, cracking or breaking, and as a result, there is a serious drawback in that the vibration isolating rubber no longer fulfills its power transmission function. In order to reduce the conduction of frictional heat to this anti-vibration rubber,
Although there is a donut-shaped elastic joint 31 in which the outer drum 40 is made hollow as shown in Fig. 7, the heat insulation effect is far from reaching the amount of heat generated by friction, and the vibration isolating rubber 39 is actually deteriorated and damaged. be.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to effectively block heat transfer from members that generate frictional heat using an air clutch or the like, and to effectively cool the above-mentioned members with circulating air, thereby preventing deterioration or damage of vibration-proof rubber due to frictional heat. It is an object of the present invention to provide an air-cooled donut-shaped elastic joint that does not cause

Means for Solving the Problems> In order to achieve the above object, the air-cooled donut-shaped elastic joint of the present invention includes an inner ring coaxially fixed to the end of the rotating shaft;
A plurality of annular anti-vibration rubbers whose inner peripheries are fixed to this inner ring and are spaced apart from each other in the axial direction, an outer ring portion with the outer peripheries of these anti-vibration rubbers fixed to the inner periphery, and an outer ring portion to which the outer ring portion is attached. a drum part fixed by a connecting part so as to form an annular space around the outer periphery of the drum part, a through hole provided in the inner ring to communicate the gap between the vibration isolating rubber and the inside of the inner ring, and a through hole provided in the outer ring part to communicate the gap between the vibration isolating rubber and the inside of the inner ring. It is characterized by comprising a through hole that communicates between the gap and the annular space, and a through hole that is provided in the connecting portion and communicates with the annular space.

Function> The outer periphery of the drum part, which is connected to the rotating shaft through the outer ring part, anti-vibration rubber, and inner ring, is connected to the friction shoe of an air clutch, for example, provided at the end of the rotating shaft that faces the rotating shaft during power transmission. generates heat through frictional contact with the inner circumference of the At this time,
The air inside the inner ring passes through the through hole provided in this inner ring that rotates together with the rotating shaft, flows radially outward through the gap between the vibration isolating rubber, and then flows through the through hole provided in the outer ring. After passing through, it turns in the axial direction, flows through the annular space between the outer ring part and the drum part, and flows out from the through hole provided in the connecting part of the drum. This circulating air cools the vibration isolating rubber, the outer ring, and the drum section, effectively suppressing the frictional heat generation in the drum section, the conduction of frictional heat through the outer ring, and the temperature rise of the vibration isolating rubber. Heat conduction from the outer ring portion to the outer ring portion is also effectively prevented, and the vibration isolating rubber does not deteriorate or break due to frictional heat.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 1 is an axial cross-sectional view of an air-cooled donut-shaped elastic joint of the present invention incorporated inside an air clutch 30 (see FIGS. 6 and 6), which is the same as the conventional example, where l is a driven shaft, and 3 is an axial cross-sectional view. An inner ring is fixed coaxially to the flange 1a at the end of the driven shaft with bolts 2, 4 is an annular anti-vibration rubber whose inner periphery is vulcanized and bonded to the inner ring 3, and 5 is an annular anti-vibration rubber whose inner periphery is vulcanized and bonded to the inner ring 3. The outer ring 6 is vulcanized and bonded to the periphery of the inner ring 3. Anti-vibration rubber 4. 7 is an elastic joint unit consisting of an outer ring 5, 6' is an elastic joint unit of the same shape, 6' is a similar inner ring 3°, anti-vibration rubber 4'', and an outer ring 5''.
8 is an intermediate ring forming an inner ring that connects both elastic joint units 6.6' in the axial direction at the inner ring 3.3';
3' and a bolt that connects the intermediate ring 7 together; 9 is a drum arranged to form an annular space A around the outer periphery of the outer rings 5 and 5'; 10.10 is a bolt that connects both end surfaces of this drum 9 and the outer ring 5 , 5° end faces are connected via bolts 12.13 with an annular heat insulating element El 1.11 in between.

Further, 14 indicates each position (
Through holes 15 are provided in the radial direction in the end plate 10 (see FIG. 2), and are inserted through the end plate 10, the heat insulating plate 11, and the drum 9 in the axial direction at respective positions dividing the circumference of the end plate 10 into 12 equal parts. This is a through hole provided to communicate with space A.

The intermediate ring 7 is a narrow ring having the same outer diameter as the inner rings 3, 3'' and slightly thicker in the radial direction. are incorporated into each. This intermediate ring 7 forms a gap B between the two anti-vibration rubbers 4.4'', and the outer ring 5.5
An annular gap C as a through hole is formed between the intermediate wheels 7 and 7.
The through hole 14 has an inner space of 3゜3゛ on the inner ring and the above-mentioned gap B.
The annular gap C communicates the gap B with the annular space A. Outer rings 5, 5 forming annular space A
The outer circumferences 5a and 5°a of the drum 9 form a symmetrical truncated conical surface whose diameter increases from the annular gap C toward both ends, while the inner circumference 9a of the drum 9 facing this forms the truncated conical surface. They form parallel annular surfaces spaced at regular intervals.

The inner ring 3 is fitted into an annular groove 1111 provided on the outer periphery of the end face of the flange la at the end of the driven shaft, and as shown in FIG. Fixed. Further, bolts 12 and 13 that are inserted through the end plate IO and connect the drum 9 and the outer ring 5,5° are arranged between the through holes 15 arranged in the circumferential direction of the end plate 10.

The air-cooled doughnut-shaped elastic joint configured as described above operates as follows.

Air clutch 30 attached to rotating drive shaft 32
When compressed air is supplied to the rubber tube 35 through the air pipe 41, the friction shoe 36 protrudes radially inward due to the expansion of the rubber tube 35 and begins to come into contact with the outer periphery of the drum 9. At this time, a large amount of frictional heat is generated due to the frictional contact between the friction shoe 36 and the drum 9, and since the friction shoe 36 is made of a heat insulating material, this frictional heat tends to be transmitted radially inward to the drum 9 side. However, the drum 9 is not in direct contact with the outer ring 5.5 degrees,
Since both ends are only connected by the end plate 10 and the bolts 12.13 via the heat insulating plate 11, the frictional heat is slightly absorbed by the bolts 12.13. It is only conducted to the outer ring 5.5° via the end plate IO and the bolt 13, and the temperature rise due to frictional heat of the outer ring 5.5° is significantly suppressed. On the other hand, the air in the 3.3° inner space of the inner ring, which is open at one end, swirls along the inner periphery of the inner ring due to the centrifugal force caused by the rotation of the driven shaft l, and enters the through hole 14 of the intermediate ring 7. Inflow. Then, as shown by the arrow in Fig. 1, the anti-vibration rubber flows radially outward through the gap B between 4 and 4 degrees, passes through the annular gap C between the outer rings 5 and 5, and then flows in the axial direction. The flow is divided into left and right sides, and flows through the annular space between the outer ring 5.5 and the drum 9, and flows through the through holes 15 in the end plates
．． 15 to the outside. This circulating air cools the vibration isolating rubber 4, the outer ring 5.5', and the drum 9, and suppresses heat transfer from the drum to the outer ring via the air. ° temperature rise is significantly suppressed. Therefore, even if the drum 9 generates excessive frictional heat due to frequent engagement/disengagement of the air clutch 30, slow engagement, or a half-clutch state due to a malfunction of the compressed air system,
Due to the heat insulating effect of the heat insulating plate and the cooling effect of the flowing air, the temperature increase of 4.4° of the vibration isolator is effectively suppressed, and the vibration isolator does not deteriorate or break. Also, the annular space A
Since it is slanted so as to widen toward both ends, it is possible to promote air circulation and further increase the cooling effect.

FIG. 3 is a cross-sectional view showing a modification of the intermediate wheel.

This intermediate ring 17 is provided with through holes 18 at each position that divides the circumference into eight equal parts, tilting toward the rotation direction of the intermediate ring (see arrow E), making it easier for air to flow in as it rotates. This makes it possible to further improve the cooling effect.

Figure 4 shows a modification of the through hole that communicates with the bulge A.
In this modification, the end plate 10. A through hole 19 is provided through the heat insulating plate 11 and the drum 9 with an inclination equal to that of the annular space A to facilitate air outflow and improve the cooling effect.

FIG. 5 shows the inner ring 3 of the above embodiment. Anti-vibration rubber 4. FIG. 6 is an axial cross-sectional view of a modification in which four elastic joint units 6 each having an outer ring 5 are connected in the axial direction. In this modification, four elastic joint units 6 are successively connected by three intermediate rings 7 and connected together with bolts 20, while right and left two of four outer rings 5
These are connected by large-diameter intermediate rings 21, 21, and connected together with bolts 24 and 24 inserted from the end plate 10 side, and arranged with an annular space A around the outer periphery of the four outer rings 5. Both end surfaces of the drum 23 are connected to the end plate 10 by bolts I2 with the heat insulating plate 11 in between. The intermediate ring 21 is provided with a plurality of radial through holes 22, and the annular space A is inclined so as to expand from the annular gap C at the center of the outer ring 5 toward both ends. This modified example not only provides the same heat insulating effect and cooling effect as in the above embodiment, but also has the advantage of being able to transmit a larger torque.

In the above embodiments and modifications, the elastic joint units 6 are sequentially connected by the intermediate ring 7 to form the gap B between the anti-vibration rubbers and the through hole C in the outer ring. Alternatively, a plurality of vibration-proof rubbers may be fixed to the outer rings at intervals in the axial direction, and through holes may be provided in the inner and outer rings so as to form air flow passages.

Also, if you sacrifice the insulation effect, drum 5. It is also possible to omit the heat insulating plate 11 interposed between the outer ring 9 and the end plate 10. Further, it is also possible to reverse the driving shaft and the driven shaft to those in the embodiment.

<Effects of the Invention> As is clear from the above description, the air-cooled doughnut-shaped elastic joint of the present invention has an inner ring coaxially fixed to the end of the rotating shaft, an inner periphery fixed to the inner ring, and A plurality of annular vibration isolating rubbers spaced apart from each other, an outer ring portion having the outer periphery of these vibration isolating rubbers fixed to the inner periphery, and connected to the outer ring portion so as to form an annular space around the outer periphery of the outer ring portion. a through hole provided in the inner ring to communicate the gap between the vibration isolating rubber and the inside of the inner ring; and a through hole provided in the outer ring to communicate the gap and the annular space. , is provided with a through hole provided in the connecting part and communicating with the annular space, so that even if the friction shoe of the rotating air clutch comes into frictional contact with the outer periphery of the drum part and generates intense frictional heat, the rotation is prevented. Air inside the moving inner ring flows in through the through hole in the inner ring, flows through the gap between the vibration isolating rubber, through the through hole in the outer ring, and the annular space between the outer ring and the drum, and flows out through the through hole in the connecting part. Since the drum section, the outer ring section, and the vibration isolating rubber are cooled, the rise in temperature of the vibration isolating rubber is significantly suppressed, and deterioration and damage of the vibration isolating rubber due to frictional heat are completely prevented, resulting in a remarkable effect.

[Brief explanation of the drawing]

FIG. 1 is an axial sectional view of an air-cooled donut-shaped elastic joint of the present invention incorporated inside an air clutch, and FIG.
FIG. 3 is a cross-sectional view showing a modification of the intermediate ring, FIG. 4 is a partial sectional view showing a modification of the through hole, and FIG. 5 is a partial sectional view of the elastic joint unit. FIGS. 6 and 7 are axial sectional views of a modified example with four joints, and FIGS. 6 and 7 are axial sectional views of a conventional doughnut-shaped elastic joint. l...Driven shaft, 2...Bolt, 3...Inner ring, 4
... Anti-vibration rubber, 5... Outer ring, 6... Elastic joint unit, 7.21... Intermediate ring, 8, 20... Bolt,
9...Drum, IO...End plate, 11...Insulation plate, 12.13.24...Bolt, 14.22...Through hole, 15...Through hole, 30... Air clutch, 3
2... Drive shaft, 35... Rubber tube, 36...
Frixigin shoe, A... annular space, B... gap, C... annular gap, D... inner space. Patent applicant: Daihatsu Diesel Co., Ltd. Representative: Patent attorney: Seishi Ao and two others Figure 3, Figure 4, Figure 6

Claims (1)

[Claims] (1) An inner ring coaxially fixed to the end of the rotating shaft, a plurality of annular vibration-proofing rubbers whose inner circumferences are fixed to the inner ring and spaced apart from each other in the axial direction, and the outer periphery of these vibration-proofing rubbers. an outer ring part fixed to the inner periphery of the outer ring part, a drum part fixed to the outer ring part by a connecting part so as to form an annular space around the outer periphery of the outer ring part, and a gap between vibration isolating rubber provided in the inner ring. A through hole that communicates with the inside of the inner ring, a through hole provided in the outer ring portion that communicates the gap and the annular space, and a through hole provided in the connecting portion that communicates with the annular space. Features an air-cooled donut-shaped elastic joint.