JP2020016281A5

JP2020016281A5 -

Info

Publication number: JP2020016281A5
Application number: JP2018139136A
Authority: JP
Filing date: 2018-07-25
Publication date: 2021-08-19
Anticipated expiration: 2038-07-25

Description

本発明によるトルクリミッタ付き歯車機構は、軸の一端側の第１キー溝に第１キーを介して固定された第１歯車と、前記第１歯車の内側面の第１切欠き部に設けられ、複数のディテント穴を有する第１板と、前記第１歯車に隣接して設けられた第２歯車の貫通孔内に設けられたボールと、前記軸の第２キー溝内で直動できる第２板と、前記第１、第２板間に配設された第２歯車と、前記第２板の内側面に形成され、前記ディテント穴に接する前記ボールの一面が接する輪状溝と、前記軸の他端側に螺合されたロックナットと、前記軸の外周位置でかつ前記ロックナットの内側に設けられたロックワッシャと、前記ロックワッシャと前記第２板との間に設けられた弾性体を、備え、前記ボールは、前記ディテント穴と前記輪状溝との間に挟持され、前記ロックナットを回転することにより、前記第２板が前記ボール側へ付勢され、前記第１歯車に対する入力トルクが一定以上となった時に、摺動する前記第２歯車と接する前記各板を第１、第２キーにより、軸に対して回転を防止することで、回転する部品を前記第２歯車と前記ボールとし、前記弾性体による力が前記第２板、前記ボール及び前記第１板へ伝達でき、前記第２歯車に軸方向に抑え付ける力を加えないようにした構成であり、また、前記弾性体は、皿バネよりなる構成である。 The gear mechanism with a torque limiter according to the present invention is provided in the first gear fixed to the first key groove on one end side of the shaft via the first key and in the first notch on the inner surface of the first gear. , The first plate having a plurality of detent holes, the ball provided in the through hole of the second gear provided adjacent to the first gear, and the second keyway capable of linearly moving in the second key groove of the shaft. The two plates, the second gear arranged between the first and second plates, the ring-shaped groove formed on the inner surface of the second plate and in contact with one surface of the ball in contact with the detent hole, and the shaft. A lock nut screwed to the other end side of the shaft, a lock washer provided at the outer peripheral position of the shaft and inside the lock nut, and an elastic body provided between the lock washer and the second plate. The ball is sandwiched between the detent hole and the ring-shaped groove, and by rotating the lock nut, the second plate is urged toward the ball side and an input to the first gear is provided. When the torque exceeds a certain level, the rotating parts are referred to as the second gear by preventing the plates in contact with the second gear that slides from rotating with respect to the shaft by the first and second keys. The ball has a configuration in which the force of the elastic body can be transmitted to the second plate, the ball, and the first plate, and no force is applied to the second gear in the axial direction. The elastic body is composed of a countersunk spring.

本発明によるトルクリミッタ付き歯車機構は、以上のように構成されているため、次のような効果を得ることができる。
すなわち、従来のように、高温と低温とで摩擦状態が変化するようなすべり機構を用いるのではなく、入力トルクが一定以上となった時は、ディテント穴７５と輪状溝８５間に保持されたボール６と第２歯車８０が回転して摺動しているため、周囲温度の上、下動変化に関係なく、摺動する第２歯車８０と接する第１板７４及び第２板７４ａをキー７１、７Ａにより軸１に対して回転を防止することで、このような時に回転する部品は第２歯車８０との前記第２歯車８０の貫通孔１００内に挿入されているボール６に限定され、温度の上、下動に伴うすべりトルクをほぼ一定に保つことができる。
また、弾性体９１による力を第２板７４ａとボール６と第１板７４に伝達させ、第２歯車８０に軸方向Ａの付勢力を加えなくて済み、安定したすべりトルクを得ることができる。
また、弾性体９１が、スプリング又は皿バネによって形成されているため、復元力が秀れており、トルクリミッタとしてのリミット精度を保持することができる。 Since the gear mechanism with a torque limiter according to the present invention is configured as described above, the following effects can be obtained.
That is, instead of using a sliding mechanism that changes the frictional state between high temperature and low temperature as in the past, when the input torque exceeds a certain level, it is held between the detent hole 75 and the ring-shaped groove 85. Since the ball 6 and the second gear 80 rotate and slide, the first plate 74 and the second plate 74a that are in contact with the sliding second gear 80 are used as keys regardless of changes in the downward movement of the ambient temperature. By preventing rotation with respect to the shaft 1 by 71 and 7A, the parts that rotate at such times are limited to the ball 6 inserted in the through hole 100 of the second gear 80 with the second gear 80. , The sliding torque due to the upward and downward movement of the temperature can be kept almost constant.
Further, the force of the elastic body 91 is transmitted to the second plate 74a, the ball 6 and the first plate 74, and it is not necessary to apply the urging force in the axial direction A to the second gear 80, so that a stable sliding torque can be obtained. ..
Further, since the elastic body 91 is formed by a spring or a disc spring, the restoring force is excellent, and the limit accuracy as a torque limiter can be maintained.

Claims

The first gear (31) fixed to the first key groove (74aA) on the one end (1A) side of the shaft (1) via the first key (71), and the inner surface of the first gear (31). A first plate (74) provided in the first notch (90) and having a plurality of detent holes (75), and a second gear (80) provided adjacent to the first gear (31). A ball (6) provided in the through hole (100), a second plate (74a) capable of linearly moving in the second keyway (82) of the shaft (1), and the first and second plates (1st and 2nd plates). The second gear (80) arranged between 74,74a) and one surface of the ball (6) formed on the inner surface of the second plate (74a) and in contact with the detent hole (75) are in contact with each other. A ring-shaped groove (85), a lock nut (88) screwed to the other end (1B) side of the shaft (1), and an outer peripheral position of the shaft (1) and inside the lock nut (88). The lock washer (88A) provided and the elastic body (91) provided between the lock washer (88A) and the second plate (74a) are provided.
The ball (6) is sandwiched between the detent hole (75) and the ring-shaped groove (85), and by rotating the lock nut (88), the second plate (74a) becomes the ball (74a). When the input torque to the first gear (31) exceeds a certain level by being urged to the 6) side, the plates (74,74a) in contact with the sliding second gear (80) are first placed on the first gear. the second key (71,7A), by preventing rotation relative to the shaft (1), and said parts to rotate the second gear (80), and said ball (6), the elastic body (91 ) Can be transmitted to the second plate (74a), the ball (6), and the first plate (74), and the second gear (80) is not subjected to an axially restraining force (A). A gear mechanism with a torque limiter, which is characterized by being configured in.

It said elastic body (91) according to claim 1 Symbol mounting of the torque limiter gear mechanism is characterized by consisting of disc springs.