JP2006214523A - Torque transfer device having nonreversible mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a torque transfer device Z having a nonreversible mechanism 4 which does not transfer rotation to an input shaft even when back drive acts on an output shaft, which reduces brake torque or enables a halt at the time of drive from the input shaft, thus which can realize fovorable torque efficiency of a system. <P>SOLUTION: The torque transfer device is provided with a pair of a first plate A and a second plate B, a ball 11 on the input side, a fifth plate C and a shaft 41. A ball lamp 12 on the input side, which is for detecting prescribed torque, is formed on the pair of the first plate A and the second plate B. Then the ball 11 on the input side is housed in the ball lamp 12 on the input side, and the fifth plate C and the shaft 41 are for reducing an energizing force acting on a brake part 3 by the displacement of the first plate A in the axis direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power transmission system for general industrial machines, aircraft equipment, etc., and does not transmit rotation to an input shaft even when a back drive acts on an output shaft and reduces brake torque when driven from the input shaft. The present invention relates to a torque transmission device having a irreversible mechanism for stopping.

Conventionally, when an initial preload is applied to the brake portion and the back drive torque is transmitted from the output side, the friction torque generated by the initial preload becomes a load, and the axial force generated at the ball ramp portion increases. . As a result, the torque limiting device is known that increases the frictional torque of the brake unit and balances the backdrive torque and the frictional torque and prevents the rotational torque from being transmitted to the input side (for example, (See Patent Document 1).
Japanese Patent No. 2756456

  However, in the conventional configuration, when torque is transmitted from the input side, the system always rotates while dragging the friction torque generated in the initial preload, so that the torque efficiency of the system tends to be poor. Therefore, regardless of the magnitude of the load torque on the output side, the brake frictional torque is always generated in the initial preload, so that there is a problem that the torque efficiency of the system is poor and more power is required.

  The present invention has been made paying attention to such problems, and the main object is to transmit rotation from the input shaft to the input shaft even when a back drive acts on the output shaft. An object of the present invention is to provide a torque transmission device having a nonreciprocal mechanism capable of reducing or stopping a brake torque and realizing a good system torque efficiency.

  That is, the torque transmission device having the irreversible mechanism of the present invention includes a pair of plates on which a ball ramp for sensing a specified torque is formed, a ball accommodated in the ball ramp portion, and a pair of the plates. A plate and a shaft for reducing a biasing force acting on the brake portion due to the axial displacement of one of the plates are provided.

  With such a configuration, the back drive torque from the output shaft side can be reliably braked, and when driven from the input shaft side, it can be driven without loss.

  In other words, even if a back drive acts on the output shaft, it does not transmit rotation to the input shaft, and when driving from the input shaft, the brake torque can be reduced or stopped, and a good system torque efficiency can be realized. A torque transmission device having a reversible mechanism can be provided.

  As described above, according to the torque transmission device having the non-reciprocal mechanism of the present invention, the device includes an input shaft and an output shaft, and the brake portion that generates friction torque by the axial force and the brake portion in the axial direction. An urging member that applies a pressing force prevents rotation from being transmitted to the input shaft even when a back drive acts on the output shaft, and when the torque is transmitted downstream from the input shaft, axial displacement corresponding to the transmitted torque is prevented. An input-side ball ramp portion is generated, and the axial load acting on the brake portion is reduced by the axial displacement of the input-side ball ramp portion, and when driving from the input shaft side, the brake torque is reduced or stopped. Therefore, the back drive torque from the output shaft side can be braked reliably, and when driving from the input shaft side It is possible to without loss drive.

  In other words, even if a back drive acts on the output shaft, it does not transmit rotation to the input shaft, and when driving from the input shaft, the brake torque can be reduced or stopped, and a good system torque efficiency can be realized. A torque transmission device having a reversible mechanism can be provided.

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

  As shown in FIG. 1, the torque transmission device Z having the irreversible mechanism 4 according to the present embodiment includes an input-side ball ramp portion 1 that detects torque from the input shaft P1 and generates an axial force, and an output shaft P2. The output side ball ramp portion 2 that detects the torque from the shaft and generates axial force, the brake portion 3 that generates friction torque by the axial force generated by the output side ball ramp portion 2, and the friction torque of the brake portion 3 is increased. The first urging member spA that urges the brake part 3 in the direction of pressing the brake part 3 is preferably provided. And a nonreciprocal mechanism 4 that reduces or cancels the force to reduce or stop the brake frictional torque, which is the brake torque generated in the brake 3. Hereinafter, each part will be described in detail. In the following description, the input side in FIG. 1 is defined as “right side” and the output side is defined as “left side”.

  The input-side ball ramp unit 1 includes a ball that senses torque from the input shaft P1 (hereinafter referred to as an input-side ball 11) and a ball lamp that accommodates the input-side ball 11 (hereinafter referred to as an input-side ball lamp 12). It is equipped with.

  Specifically, the input-side ball lamp 12 is connected to the input shaft P1 and received by the first plate A that receives the biasing force in the direction of moving to the output side by the second biasing member spB, and the lock nut portion n1. The input side ball 11 housed in the input side ball lamp 12 is formed on both of the second plate B which is restricted so as not to be displaced in the axial direction and whose inner edge portion is splined to the output shaft P2. The state is sandwiched between the first plate A and the second plate B. In this embodiment, a disc spring having a substantially C-shaped spring property is used as the second urging member spB, and the inner edge portion is supported by the lock nut portion n2. However, the present invention is not limited to this. I can't.

  The output-side ball ramp unit 2 includes a ball that senses torque from the output shaft P2 (hereinafter referred to as an output-side ball 21) and a ball lamp that accommodates the output-side ball 21 (hereinafter referred to as an output-side ball lamp 22). It is equipped with. Specifically, the output side ball lamp 22 has the same configuration as that of the input side ball lamp 12, and is formed on both the third plate D and the fourth plate E that are formed integrally with the output shaft P2. The output side ball 21 housed in the output side ball lamp 22 is in a state of being sandwiched between the third plate D and the fourth plate E.

  The brake unit 3 includes a plurality of friction plates 31 that are splined to the outer periphery of a cylindrical member EE provided integrally with the fourth plate E, and a plurality of friction plates 32 that are splined to the inner surface of the housing H. They are arranged so as to overlap each other in the direction parallel to the input / output axis P2.

  The nonreciprocal mechanism 4 is disposed between the lock nut portion n1 and a fifth plate C described later, and includes a first urging member spA that urges the brake portion 3 in a direction to press the brake portion 3 toward the output side, A fifth plate C that can advance and retreat between a contact position and a contact release position, and a shaft 41 that connects the outer edge portion of the fifth plate C and the outer edge portion of the first plate A. In the case where torque is applied to the input shaft P1, the first urging force that acts on the brake portion 3 when the fifth plate C moves to the right as the first plate A moves to the right. The biasing force of the member spA is reduced or released to prevent the brake part friction torque in the initial preload from being reduced or stopped. On the other hand, when no torque is applied to the input shaft P1, the first biasing is applied to the brake part 3. Of member spA By the action of force, in which generates a brake unit friction torque in the initial preload. In the present embodiment, a disc spring similar to the second biasing member spB is used for the first biasing member spA, but is not limited thereto.

  Hereinafter, the operation of the torque transmission device Z having the irreversible mechanism 4 will be specifically described.

  (1) When back-driven from the output shaft P2 side.

  The initial friction torque is generated in the brake portion 3 by the initial preload of the first urging member spA urging to the left side.

  Since the axial force is generated in the output side ball ramp portion 2 by the output shaft P2 side back drive torque, the friction torque of the brake portion 3 increases.

  Since the brake unit 3 is configured to generate a friction torque that can sufficiently counter the maximum back drive torque, the back drive torque and the friction torque are balanced, and torque (rotation) is applied to the input shaft P1 side. Is never transmitted.

  (2) When driving from the input shaft P1.

  When a torque that opposes the output side load torque is input, the input side ball ramp portion 1 becomes a torque transmission path.

  The axial force generated by transmitting torque to the input-side ball ramp portion 1 overcomes the total load of the first urging member spA and the second urging member spB, and moves the first plate A to the right side. At this time, the second plate B is not moved because the axial displacement is limited by the lock nut portion n1.

  As the first plate A moves to the right side, the fifth plate C connected to the first plate A by the shaft 41 also moves to the right side.

  As the fifth plate C moves to the right, the load of the first urging member spA is not transmitted to the brake part 3, so that no friction torque is generated.

  As a result, when torque is transmitted from the input side, it is not necessary to drag the friction torque of the brake unit 3, and the system can be driven with input torque corresponding to only the load on the output side.

  Thus, according to the torque transmission device Z having the irreversible mechanism 4 according to the present embodiment, the back drive torque from the output shaft P2 side can be reliably braked, and the input shaft P1 side In the case of driving from the start, it is possible to drive without loss.

  In other words, even if a back drive acts on the output shaft P2, the rotation is not transmitted to the input shaft P1, and when driving from the input shaft P1, the brake torque can be reduced or stopped to achieve a good system torque efficiency. A torque transmission device Z having a possible non-reversible mechanism 4 can be provided.

  The present invention is not limited to the embodiment described in detail above.

  For example, the shapes of the input shaft P1 and the output shaft P2 are not limited to those of the present embodiment, and can be appropriately changed according to the embodiment.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

The figure which shows typically the structure cross section of the torque transmission apparatus which has a nonreciprocal mechanism which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Input side ball ramp part 3 ... Brake part 4 ... Non-reciprocal mechanism P1 ... Input shaft P2 ... Output shaft spA ... Biasing member First biasing member)
Z: Torque transmission device

Claims (1)

  A device having an input shaft and an output shaft, which is input even when a back drive acts on the output shaft by a brake portion that generates friction torque by an axial force and a biasing member that applies a pressing force to the brake portion in the axial direction. It has an input-side ball ramp portion that prevents axial rotation and generates axial displacement corresponding to the transmitted torque when transmitting torque downstream from the input shaft. Thus, the torque transmission device having a nonreciprocal mechanism is characterized in that the axial load acting on the brake portion is reduced and the brake torque is reduced or stopped when driving from the input shaft side.

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