JPH0719656U - Torque transmission device - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the parts that greatly slide and wear when transmitting torque, and to prevent the magnitude of the transmitted torque from changing at an unexpected location. [Structure] A liquid 7 is enclosed between a pair of cored bars 2 and 3 that are rotatably combined with each other. The torque is transmitted to the other core metal 3. Further, a frictional resistance expanding portion 8 for increasing the frictional resistance with the liquid 7 is provided on the inner surfaces of the cored bars 2, 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvements in a torque transmission device. The torque transmission device of the present invention is mounted between rotating members to transmit rotational torque and absorb vibration or noise, and is used, for example, in a gear transmission device such as a transmission of an automobile.

[0002]

[Prior art]

 As shown in FIG. 5, a known torque transmission device 21 is formed by vulcanizing and adhering a rubber-like elastic body 23 to one core bar 22. For example, the core bar 22 is attached to a rotary shaft 42 via a sleeve 41. The rubber-like elastic body 23 is fixed and pressed against the gear 43, and the frictional resistance between the rubber-like elastic body 23 and the gear 43 transmits torque and absorbs vibration or noise. The gear 43 is rotatably supported by the sleeve 41 via a needle roller 44.

[0003]

[Problems to be solved by the device]

 In the above conventional torque transmission device, the rubber-like elastic body 23 substantially slides strongly against the gear 43. Therefore, there is a problem that the rubber-like elastic body 23 gradually wears and the magnitude of the torque transmitted with it gradually changes at an unexpected place.

[0004]

[Means for Solving the Problems]

 In view of the above points, the present invention has been devised in order to solve the problems found in the above-mentioned prior art, and in order to achieve this object, as shown in claim 1, it is combined with relative rotation. A liquid is sealed between a pair of cored bars, and torque is transmitted from one cored bar to the other cored bar via the liquid due to the frictional resistance between each cored bar and the liquid. A torque transmission device is provided. According to a second aspect of the present invention, there is provided the torque transmission device according to the first aspect, wherein the inner surface of the cored bar is provided with a frictional resistance expanding portion for increasing a frictional resistance with the liquid. provide.

[0005]

[Action]

 If one rotating member rotates with one rotating metal member fixed to one rotating member and the other rotating metal member fixed to the other rotating member, sliding wear like the rubber-like elastic body in the prior art will occur. Despite the absence of parts, torque is transmitted from one rotating member to the other rotating member via one core metal, liquid and another core metal. The magnitude of the frictional resistance between the core metal and the liquid is appropriately adjusted at the time of manufacturing the torque transmission device according to the usage conditions, etc. It can be easily adjusted by providing or enclosing a liquid having a predetermined viscous resistance.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, first and second metal cores 2 and 3 each having a substantially L-shaped cross-section are concentrically and relatively rotatably combined with each other. A rubber-like elastic rubber first seal 4 vulcanized and adhered to the outer peripheral edge is in close contact with the second core metal 3 and vulcanized and adhered to the inner peripheral end of the second core metal 3. The second seal 5 made of an elastic material is in close contact with the first core metal 2, and an annular sealed space 6 is provided between the first and second core metals 2 and 3. Is filled with the liquid 7 having a predetermined viscous resistance. Further, a frictional resistance expansion portion 8 for increasing the frictional resistance with the liquid 7 is attached to the inner surface of the second core metal 3 as a separate component.

As shown in FIG. 2, when the rotary shaft 42 rotates while the first core metal 2 is fixed to the rotary shaft 42 via the sleeve 41 and the second core metal 3 is fixed to the gear 43. , Torque is transmitted from the rotary shaft 42 to the first core metal 2 via the sleeve 41, and further frictional resistance between each core metal 2, 3 and the liquid 7 causes the first core metal 2 to connect to the liquid 7 and the second core 2. It is transmitted to the gear 43 through the cored bar 3. Therefore, the torque can be transmitted even though there is no sliding wear portion like the rubber-like elastic body 23 in the prior art. It is possible to prevent the size of the item from changing without permission. The seals 4 and 5 in the torque transmission device 1 are combined with each other so that the first and second cored bars 2 and 3 are not indiscriminately separated from each other and the close contact force (tightening allowance) as long as it can seal the liquid 7 ) Is in close contact with the first or second cored bar 2, 3 and does not strongly press against the mating member with the first meaning of torque transmission unlike the rubber-like elastic body 23 in the prior art. Therefore, the sliding wear caused by the operation of the seals 4 and 5 does not pose any problem at the level intended by the present invention.

The magnitude of the frictional resistance between the cored bars 2 and 3 and the liquid 7 is appropriately adjusted at the time of manufacturing the torque transmission device 1 according to usage conditions and the like. It is possible to adjust easily by providing the frictional resistance expanding portion 8 having the size or shape of the above, or by enclosing the liquid 7 having a predetermined viscous resistance. The size and shape of the are not limited, and are determined purposefully. In this regard, the frictional resistance enlarged portion 8 shown in FIG. 1 has a rectangular cross section and is an annular body having no irregularities as shown in FIG. Since the product increases, the frictional resistance can be increased, but the frictional resistance may be divided in the circumferential direction as shown in FIG. It may also have a feather shape. Further, they may be integrally formed with the cored bars 2 and 3, or may be provided on both the first and second cored bars 2 and 3, respectively.

[0010]

[Effect of device]

 The present invention has the following effects. That is, in common with claims 1 and 2, a liquid is sealed between a pair of cored bars that are rotatably combined with each other, and the frictional resistance between each cored bar and the liquid causes one cored bar to pass through the liquid. By transmitting torque to another core, the rubber-like elastic body wears because the torque can be transmitted despite the fact that there is no sliding wear part like the rubber-like elastic body in the prior art. Thus, it is possible to prevent the magnitude of the transmitted torque from changing without permission in an unexpected manner. Further, as described in claim 2, by providing a frictional resistance expanding portion having a predetermined size or shape on the inner surface of the cored bar, or by enclosing a liquid having a predetermined viscous resistance, Since the frictional resistance can be easily adjusted, it is possible to easily procure products that meet the demand.

[Brief description of drawings]

FIG. 1 is a half cutaway view of a torque transmission device according to an embodiment of the present invention.

FIG. 2 is a half-cut sectional view showing a mounted state of the torque transmission device.

FIG. 3 is a sectional view of the torque transmission device cut at a right angle to a central axis.

FIG. 4 is a sectional view of a torque transmission device according to another embodiment of the present invention cut at a right angle to a central axis.

FIG. 5 is a half-cut sectional view showing a mounted state of a torque transmission device according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torque transmission device 2,3 Core metal 4,5 Seal 6 Sealed space 7 Liquid 8 Friction resistance expansion part 41 Sleeve 42 Rotating shaft 43 Gear wheel 44 Needle roller

Claims (2)

[Scope of utility model registration request] 1. A liquid (7) is enclosed between a pair of cores (2) (3) which are rotatably combined with each other, and the liquid (7) is sealed between the cores (2) (3) and the liquid (7). A torque transmission device characterized by transmitting torque from one core metal (2) to another core metal (3) through the liquid (7) by frictional resistance. 2. The torque transmission device according to claim 1, wherein the cored bar (2) (3) is provided on its inner surface with a frictional resistance expansion portion (8) for increasing the frictional resistance with the liquid (7). A torque transmission device characterized by.