JPS5817892B2 - Hensokuki - Google Patents

Description

[Detailed Description of the Invention] Conventionally, a ball and cone system or a troco tile system has been used as a rolling friction drive transmission with an adjustable speed ratio, but the rolling elements only rotate on their own axis, The structure was complicated because the gear ratio was adjusted steplessly by changing the gear ratio.

The present invention aims to provide a transmission with a simple structure that does not require stepless speed change and is suitable for use when changing speeds to several gear ratios designed in stages. The blade is divided into a plurality of fixed bearing rings that are loosely fitted to each other, and one of the divided fixed bearing rings is selectively brought into contact with the steel ball at different contact angles. This invention relates to a transmission in which a stepwise gear ratio can be obtained.

Next, an embodiment of the present invention will be described with reference to the drawings. A steel ball 4 is held in a pocket hole 3 of a carrier shaft 2 that is rotatably supported in a housing 1. A fixed bearing ring 5 fitted therein and a rotating bearing ring 8 loosely fitted to a rotating shaft 7 rotatably supported within a second housing 6 fixed within the housing 1 so as to be movable only in the axial direction. It is designed to rotate and revolve in contact with the planet.

The rotating raceway ring 8 is pushed by the boiling spring 9 and the hole wrap mechanism 10 to apply a vertical load to the contact surface between the raceway surface 81 and the steel balls 4.

The fixed raceway ring 5 is divided into two inner and outer fixed raceway rings 5a and 5b which are concentric and have different diameters, each having a raceway surface 51a51b.

The fixed bearing ring 5a is loosely fitted to the inner circumferential surface of the housing 1, and the fixed bearing ring 5b is loosely fitted to the fixed bearing ring 5a, and both are movable in the axial direction.・It is designed to make contact with ball 4.

Both fixed bearing rings ``5a'' and ``5b'' are fitted together with screws 11.

- A collar 12 is provided on the outer periphery of the end opposite to the raceway surface of the fixed raceway ring 5b, and several protrusions 13 are provided on the end surface, and a groove 1' is provided on the stopper surface 14 of the housing 1. It meshes with 5.

The housing 1 has a long window 1 in the circumferential direction as shown in FIG.
6' is bored through this long window 16, and the lever 1T is removably screwed into several screw holes 18 that are formed in the fixed bearing ring 5a at intervals in the circumferential direction.

Therefore, the fixed bearing ring 5a can be rotated by inserting the lever 17 into the screw hole 18 and moving it in the circumferential direction.

Now, when the lever 17 is moved to rotate the fixed raceway 5a in one direction, the fixed raceway 5b will move between the nose 1 and the protrusion 13.
Since they are interlocked and do not rotate, the fixed bearing ring 5a is moved in the axial direction by the screw 11.

If this direction of movement is to the right in FIG.

When the fixed bearing ring 5a is further rotated in the same direction, the fixed bearing ring 5b moves to the left, away from the steel balls 4, and moves until the protrusion 13 contacts the surface of the stopper 14 of the housing 1, that is, the bottom of the groove 15. .

When the lever 17 is moved to rotate the fixed bearing ring 5a in the opposite direction, the fixed bearing ring 5b does not rotate, so the fixed bearing ring 5
a moves to the left, separates from the steel ball, hits the stopper surface 14 of the housing 1, and stops.

Further, if the fixed bearing ring 5a continues to be rotated in the same direction, the fixed bearing ring 5b will move to the right in the axial direction, and the fixed bearing ring 5a will move from the collar 12 to the fixed bearing ring 5.
It hits the end face of a and serves as a stopper, and also contacts the steel ball 4.

Either one of the fixed bearing rings 5a, 5b thus divided is moved in the axial direction and brought into contact with the steel balls 4.

Since the steel balls are pressed from the rotating bearing ring 8 side, rolling frictional driving force is applied to them.

Since the carrier shaft 2 rotates at the same number of revolutions as the revolution number of the steel balls 4, the ratio of the number of revolutions of the carrier shaft to the number of revolutions of the rotating shaft 7 fitted with the rotating bearing ring 89, that is, the gear ratio is as follows. It is shown by the formula.

As is clear from this equation, it can be seen that the speed can be changed in stages by changing the contact angle α between both bearing rings and the steel ball.

Therefore, the raceway surface 51 of the fixed raceway. l! 51b through the steel balls 4 and the raceway surface 81 of the T rotary raceway ring so that the raceway surface 54 is securely in contact at a predetermined contact angle α
The radii of curvature of a, 5 l and b are made larger than the radius of the steel ball 4, and the center position of the radius of curvature is placed substantially on the contact angle line 20.

FIG. 1 shows a state in which the steel balls 4 are in contact with the rotating raceway 8 and the fixed raceway 5a, the contact angle α is approximately 45°, and the fixed raceway 5a is moved to the left and the fixed raceway 5b is moved to the left. The contact angle when the steel ball 4 is brought into contact with the steel ball 4 is designed to be 90°.

In the embodiment shown in FIG. 3, the fixed raceway ring 5 is divided into three concentric fixed raceways 5c, 5d, and 5e of different diameters, each having raceway surfaces 51c*5 and 1dt51e.

The outer fixed bearing ring 5c is loosely fitted to the inner surface of the housing 1, and the middle fixed bearing ring 5d is loosely fitted to the inside of the fixed bearing ring 5c and screwed together with screws 11a.

The inner fixed raceway 5e is spaced from the inner surface of the fixed raceway 5d, and all three fixed raceways are movable in the axial direction.

. The fixed bearing ring 5e has a flange 21 extending outward, and the fixed bearing rings 5c and 5d can come into contact with the flange 21 at the end face opposite to the raceway surface, that is, at the left end in the figure.

A coil spring case 22 is attached to the housing 1 with a nut 2.
3, and through holes 24 are formed in the case 22 at intervals in the circumferential direction.

A stopper 25 for setting a load is inserted into a screw 2 on the outside of the case 22, and a flange 27 extending inside the stopper 25 is connected to the through hole 2.
4 is pressed against the flange 21 of the fixed bearing ring 5e, and the fixed bearing ring 5e is pressed in the axial direction toward the steel ball 4, and as described later, the steel ball 4 Apply an axial load to.

The stopper 25 is rotated by a removably screwed lever 29, and is moved axially relative to the case 22 to adjust the axial load caused by the coil spring.

A lever 17a for rotating the fixed bearing ring 5c is removably screwed into the fixed bearing ring 5cζ6, and is inserted into the long window 16 of the housing 1. It can be stretched circumferentially within a.

In Fig. 3, the equal-rate bearing ring 5e is pressed by the coil spring 28 and is in contact with the steel ball 4, and the steel ball 4 is in contact with the fixed bearing ring 5e and the rotating bearing ring 8, and rotates and revolves around its axis. do.

The fixed bearing ring 5ct5a is separated from the steel balls.

. When the lever 17a is now moved to rotate the fixed bearing ring 5c, the left end of the fixed bearing ring 5c is in contact with the flange 21, so the fixed bearing ring 5d moves to the right.

Although the fixed bearing ring 5d is not shown, it is non-rotatable and movable only in the axial direction, similar to the fixed bearing ring 5b of the Song example shown in FIG.

As the fixed bearing ring 5cm continues to rotate, the fixed bearing ring 5 will eventually become fixed bearing ring 5.
The raceway surface 51d of d is in contact with the steel ball.

As the rotation continues, the fixed bearing ring 5d contacts the steel balls and cannot move further to the right, so the fixed bearing ring 5c moves to the left while pushing the flange 21 against the coil spring, and therefore the fixed bearing ring 5e moves to the left. Leaving the ball, the steel ball 4 comes into contact with the intermediate fixed bearing ring 5d and the rotating bearing ring 8, and does not rotate.

The steel ball 4 has a coil spring 28 to a flange 28, hard::F
:址二：'aG＠：”L,”? , the raw fixed bearing ring 5' that rotates the two wheels 5c in the opposite direction moves to the left with respect to the fixed bearing ring 5c, and the space between the fixed bearing rings 8 moves to the right due to the force of the coil spring, and soon the fixed bearing ring 5d5e turns to the steel. touch the ball.

Further, the lever 17a is moved to move the fixed bearing rings 5d in four rows, returning to the state shown in FIG. 3.

When the lever 17a is moved further, the left end of the fixed bearing ring 5d hits the flange 28, so it is fixed.

The fixed raceway ring 5C moves forward, and its raceway surface 51c comes into contact with the steel ball and stops moving to the right.

When the lever 5a is further moved, the intermediate fixed bearing ring 5d moves to the left while pushing the flange 28 against the coil spring, the fixed bearing ring 5e separates from the steel ball, and the fixed bearing ring 5C and the rotating bearing ring 8 move toward the steel ball. Close to 4.

In this way, by selecting any one of the three divided fixed raceway rings and bringing it into contact with the steel ball, as mentioned above, the fixed raceway ring 5 is divided into several concentric circles. By dividing the fixed bearing rings into ζ fixed bearing rings, making them movable in the axial direction, and selecting any one of these fixed bearing rings and bringing it into contact with the steel ball, ζ fixed bearing rings, steel balls, and fixed bearing rings. Since the contact angle α between the bearing rings 8 can be arbitrarily selected from among several preset contact angles and changed, it is easy to move the divided fixed bearing rings selectively in the axial direction. A mechanism that allows you to change the gear ratio.

Therefore, when implemented in a transmission that requires only a limited number of gear ratios, it is possible to achieve a much simpler purpose in construction than conventional continuously variable transmissions.

A brief description of the drawing.

Fig. 1 is a vertical sectional view of an embodiment of the present invention, and Fig. 2 is a longitudinal sectional view of an embodiment of the present invention.
A cross-sectional view taken along the line -■ and FIG. 3 are cross-sectional views of main parts of another embodiment.

1...Housing, 2...Carrier shaft, 3...Pocket hole, 4...Steel ball, 5
...Fixed bearing ring, 5a, 5b, 5c, 5
d, 5e・−・=−・divided fixed bearing ring, 8・・
...Rotating bearing ring.

Claims (1)

[Claims] 1. In a rolling friction drive transmission in which a steel ball held in a pocket hole of a carrier shaft contacts a fixed bearing ring and a rotating bearing ring and revolves around its own axis, the fixed bearing ring is connected to a housing. It is divided into a plurality of concentric fixed bearing rings that are loosely fitted to each other so as to be movable on the inner peripheral surface, and one of the divided fixed bearing rings can selectively contact the steel ball. The radius of curvature of the raceway surface of each bearing ring is larger than the radius of the steel ball, and the center of the radius of curvature of the raceway surface is substantially on the contact angle line between the steel ball and the bearing ring. Transmission located at. □