JPS5846252A - Roller bearing type multistage transmission - Google Patents

Abstract

PURPOSE:To obtain a high speed change ratio by providing in multistage transmission mechanisms each of which uses an inner race as an input shaft and an retainer provided with a strength suitable for a required power transmission as an output shaft. CONSTITUTION:When a driving shaft 1 is rotated by a motor or the like, an inner race 9 of a first angular ball bearing rotates to rotate a ball 11 clamped between the inner race 9 and an outer race 10 by a set pressure of a spring 29 to revolve a first output shaft 12 retaining the ball 11. The first output shaft rotates an inner race 20 of a second angular contact ball bearing, and a second output shaft 23 is revolved due to the rotation of a ball 22. That is, the rotational speed of a transmission shaft 27 integral with the second output shaft is a rotational speed having speed ratio in which the product of a first stage speed down ratio and a second stage speed down ratio is made a speed down ratio. By providing in multistage the speed reduction shafts, that is, speed change mechanisms, a high reduction ratio can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION A rolling bearing has balls or rollers sandwiched between an inner ring and an outer ring, and a cage is revolved by the rotation of the balls or rollers. This revolution speed is a low speed with a constant reduction ratio relative to the rotation speed of the inner ring of the rolling bearing, and this mechanism constitutes a transmission mechanism.

The present invention relates to a method for obtaining a high gear ratio by sequentially arranging a transmission mechanism for revolution of the cage in multiple stages.

The device of this invention uses gears, pulleys, etc. and has nine rollers.
Because the structure uses the bearing itself, it is extremely compact, has high strength, generates little noise and heat, and operates with high precision.

The cage holds the balls or rollers apart and does not allow them to touch each other! : Since there is no separator, it does not have the strength to transmit power, but in this invention, the retainer becomes a power transmission member, so it is necessary to provide it with strength suitable for the required power transmission. Even in commercially available rolling bearings, there is a fairly wide gap between the outer diameter of the inner ring and the inner diameter of the outer ring, and the hollow cylinder that can be accommodated in between can be made quite thick.
It can be made into a high-strength power transmission member that also serves as a retainer.

FIG. 1 is a longitudinal sectional side view of a two-stage angular ball bearing type transmission, which is an example of the present invention.

A bearing S is held in an end cap q provided with a bright end face of a lumen 3 opening on the right side of a cylindrical main body. The drive shaft/ is rotatably supported by fitting into the bearing S and the inner ring 9 of the first angular contact ball bearing G provided between the thrust bearing 6 and the shaft collar 7 installed inside the end cover. .

The outer ring IO of the first angular contact ball bearing is fitted into the inner cavity 3, and a plurality of balls/4 are sandwiched between the outer ring IO and the inner ring D.

A hollow cylindrical first output shaft/2 is inserted between the outer diameter of the inner ring 9 and the inner diameter of the outer ring io, so that the balls can be transferred at small intervals so as to correspond to the original position. Ball holding holes /3 corresponding to the number of gates are provided to hold the balls / and /.

An outwardly opening shaft suspension /f is provided on the left side of the first output shaft /2, and a rotation stopper ring /S and a thrust bearing 16 are stacked and sandwiched between it and the outer ring 10. Stop ring! A locking pin /7 is provided on the outer periphery of the anti-rotation bottle / held in the main body λ.
1 is inserted with a small gap so that the detent ring and the main body cannot rotate relative to each other. The left side of the shaft rod/g fits into the inner ring 20 of the second angular contact ball bearing 19, and the thrust bearing 1
6 to rotatably support the first output shaft.

The balls 22 held between the inner ring 20 of the first angular contact ball bearing and the outer ring 21 that fits into the inner cavity 3 are inserted between the inner and outer rings, as in the case of the first angular contact ball bearing, to increase the strength. The second output shaft 23 is removably held in a ball holding hole provided in the second output shaft 23 .

The left side of the second output shaft 23 has a normal rotating shaft configuration, and is provided with a transmission shaft 27 that passes through the center of the left bottom part λS of the inner cavity 3 and is supported by a needle roller bearing 2B, and a stop ring 2g. , its left end face is pushed to the right by a plurality of springs 2-9 evenly on the bottom part 25.The right end face of the detent ring 2g is pressed against the outer ring 2
A detent ring 31 held in a main body is inserted into a pin hole 30 provided on the outer periphery of the ring with a small gap so that the detent ring and the main body cannot rotate relative to each other.

32 is a tightening bolt that attaches the right end cover q to the main body, 33 is a ring cover that holds the bearing S', and 3tI is a tightening bolt thereof.

In this configuration, the pressure set on the spring 2q acts as follows. That is, the spring pressure pushes the detent ring 2t to the right, and the outer ring 21 whose end surface is in contact with the detent ring 2t is pushed to the right.
The raceway surface of the outer ring 21 presses the ball 22 against the raceway surface of the inner ring λσ, and the inner ring 20 is pushed to the right, pushing the shaft bearing /& of the second output shaft to the right, and the shaft bearing /q is the thrust bearing /6. The anti-rotating ring /S which pushes the ball to the right and makes end face contact with it is rotationally insulated from the shaft ring /& and does not rotate, and pushes the outer ring 10 to the right, and the outer ring 10 pushes the ball // to the inner ring 9. The inner ring 9 pushes the shaft 7 of the drive shaft, which is in contact with its end surface, to the right, and the shaft 9 is rotationally insulated through the thrust bearing 6, and its rightward thrust is supported by the end cover q. .

Now, when the drive shaft l is rotated by an electric motor or the like, the inner ring 9 of the first angular ball bearing rotates, and the ball /l held between it and the outer ring 10 rotates by the set pressure of the spring 2q.
The first output shaft/2 holding this sphere is rotated around the revolution. That is, the first output shaft becomes the first stage reduction shaft. The first output shaft rotates the inner ring 20 of the second angular ball bearing, and the rotation of the ball 22 causes the second output shaft 23 to revolve. That is, the second output shaft becomes the second stage reduction shaft. That is, the second output shaft and the transmission shaft J? The rotational speed is the rotational speed at which the reduction ratio is the product of the first-stage reduction ratio and the second-stage reduction ratio with respect to the drive shaft. By arranging this reduction shaft, that is, the transmission mechanism in multiple stages, a high ratio transmission can be obtained.
The device of this invention will be obtained.

FIG. 2 is an enlarged view of a portion of the sphere l/ in FIG. 1. The set pressure by the spring 29 pushes the detent ring in the direction of the arrow, and the ball is held under pressure in the direction of the contact angle α and in contact with the raceway surfaces of the inner and outer rings at points e and f, respectively. , rotates and revolves due to the rotation of the inner ring 9. If the radii from the bearing center to points e and f are r8 and r2, then the first output shaft! 2 rotations are at a rate of 1 rotation.

FIG. 3 is an explanatory diagram in which the contact point g between the first output shaft 12 and the ball // and the positions of points e and f in FIG. 2 are arranged on the same drawing. In this figure, the inner ring D is driven by the drive shaft l and rotates in the direction of the arrow, and one ball // is held under pressure at points 0 and f and rotates in the direction of the arrow without slipping, and the first output is It revolves in the direction of the arrow while sliding on axis l and point g.

The load torque acting on the first output shaft 12 from the power transmission shaft 27 becomes a frictional resistance that prevents the rotation of the ball /'/ at point g.This frictional resistance is overcome and the ball // rotates. It is necessary to
The contact sliding friction force at the point is greater than the frictional resistance that attempts to prevent rotation, and the ball must rotate due to the moment of the couple due to the frictional force at points e and f, and slip at point g. Since the frictional force at points e and f in 7 is generated by the set pressure applied by the spring 29, the set pressure of the spring that acts as a thrust is within the allowable range for the rated load of the applied angular contact ball bearing. The ball rotates on its own axis, and a load torque within a range that does not prevent this rotation can be applied to the transmission shaft core. Since the 9-roller bearing has a small volume and high strength, a compact and powerful transmission can be obtained at low cost.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional side view of an embodiment of the present invention, Fig. 2 is an enlarged longitudinal cross-sectional view of a portion of an angular contact ball bearing, and Fig. 3 is a cross-sectional view of a contact point portion of the balls of an angular contact ball bearing arranged on the same drawing. An explanatory diagram. /...Drive shaft, K...Body, 3...Inner cavity, q...End cover,
S...Bearing, 6...Thrust bearing, 7...Shaft circumference, Z...
The first angular contact ball bearing?・・Inner ring, lθ・・Outer ring, /
'/...Ball, 12...First output shaft, /3...Ball holding hole,
ltI... Shaft circumference, /3... Stop ring, /6... Thrust bearing, 17... Bottle hole, /za... Stop pin, /wo... Second angular contact ball bearing 1.20... Inner ring. , 2/...
Outer ring, 22...Ball, 23...Second output shaft, 2q...Ball holding hole, 2S...Left bottom of inner cavity, 26...Needle roller bearing,
27... Transmission shaft, 2g... Stop ring, 29... Spring,
30Φ etc. bottle hole, 31... anti-rotation bottle, 32... tightening bolt, 33... bearing cover. 3g...Tightening bolt, e, f, g...Contact point, α...Contact angle, rl, r2...Radius from the bearing center to points e and f

Claims (1)

[Claims] A roller bearing type multi-stage transmission device with a multi-stage transmission mechanism in which the inner ring is the input shaft and the output shaft is a retainer with strength suitable for the required power transmission.