JPS60201158A - Power transmission device - Google Patents

Abstract

PURPOSE:To obtain a rotary power transmission device which can attain a high multiply or reduction speed ratio and has a little backlash by transmitting a rotating motion between rotary shafts having screw grooves and different diameters through balls disposed in the corresponding screw grooves. CONSTITUTION:When the first rotary shaft 1 is turned once, the speed of the second rotary shaft 3 is reduced to one integerth, and the speed of the third rotary shaft 6 is reduced to one squared integerth. At this time, the lead angles of screw grooves 8 are same, so that there causes no resistance against balls 9 at the lead angles, and the speed is reliably reduced without slipping of the balls 9. On the contrary, when the third rotary shaft is rotated as an input shaft, in contrast with the above operation, the speed of the second rotary shaft and the first rotary shaft are multiplied.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a power transmission device, and is filed on March 9, 1982.
The special request filed on the same date is related to the improvement of the J-force transmission device.

[Technical background of the invention and its problems] The proposed power transmission device fi) Well, the first rotating shaft having a threaded portion on the outer periphery has the same integer as the pitch J and the big circle diameter of the threaded portion. (G pip and big circular diameter threaded parts are formed 4i4 with a second rotating shaft on the right side of the outer periphery, and these first rotating shafts 11 and 11 are made parallel to the second rotating shaft, and their axes are parallel to each other. The rotary shafts are rotatably supported together with a spacing set so that the two screw threads 1 that are aligned with each other come into contact with each other via a ball, and the abutting position is performed as the rotary shafts rotate. It is designed to be able to continuously supply balls to the machine.It has a very simple structure and transmits power by reliably increasing and decelerating it.Furthermore, it is small and inexpensive, so it is suitable for various machines. It is extremely useful and excellent as it can be easily used for various purposes.

However, when it is actually installed in a machine, it is necessary to increase/decrease the ratio in order to produce a large output from a small output driving force, or to increase the high speed rotation by one level from a low speed rotation, and also to reduce the size of the machine. In order to achieve this goal, and also from a functional point of view, a power transmission device in which an input shaft and an output shaft are arranged on the same axis is often required. In that case, in the proposed power transmission device,
Although the input shaft and the output shaft are parallel to each other, they are not arranged on the same axis, so the above requirements cannot be met. In order to obtain an increase/deceleration ratio of about The problem was that the threaded part of the shaft was very large and became loose.

``Object of the Invention'' In view of the above-mentioned points, the present invention forms the input shaft and the output shaft on the same axis, and provides IS with a high acceleration/deceleration ratio even though it is small. We provide products that enable reliable power transmission at low prices.
It was created for the purpose of

[Summary of the Invention] In order to achieve the above-mentioned object, the present invention provides a first rotating shaft having a machine screw portion on the outer periphery, a pitch of the machine screw portion, and a pitch of the same integer 411 with respect to the pitch center diameter. , a second rotating shaft that has a large threaded part with a pitch circle diameter and a small threaded part that is the same as the small threaded part on the outer periphery, and a third rotating shaft that has the same large threaded part as the large threaded part on the outer periphery. The first rotating shaft and the second rotating shaft have their axes parallel to each other, and the small screw portion of the first rotating shaft and the large screw portion of the second rotating shaft face each other,
The matching screw grooves are rotatably supported together by setting the interval between the rotating shafts so that they come into contact with each other through the balls, and furthermore, the third rotating shaft 611 is supported so that its axis is parallel to the axis of the second rotating shaft. C
In addition, it is arranged so as to be on the same line as the axis of the first rotating shaft, and the small threaded part of the second rotating shaft and the large threaded part of the third rotating shaft are made to face each other, and the matching screws are connected through the ball. A ball is brought into contact and rotatably supported, and the ball is placed at the abutting position between the first rotating shaft and the second rotating shaft and at the abutting position between the second rotating shaft and the third rotating shaft. The present invention consists in that it is possible to continuously supply the balls, and that the supplied balls can be appropriately adjusted so as to be arranged on tangent lines between the facing threaded portions.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings.

That is, the reference numeral 1 shown in the figure is a first rotating shaft, which has, for example, a first machine screw part 2 on its outer periphery with a pitch of P and a pitch diameter of D. Further, reference numeral 3 denotes a second rotating shaft, and the outer periphery has a pitch and a pitch circle diameter of −CQH'4 and pitch circle diameter equal to the pitch and pitch circle diameter of the first machine screw part 2. nP (n is an integer) pitch circle diameter is set to nD; 1 large screw part 4 and the 1st small screw part 2 have the same pitch P and pitch circle diameter. It is something that can be read. Further, reference numeral 6 denotes a third rotating shaft, and the first large screw portion 4 has the same pitch n on its outer periphery.
P, pitch circle diameter nD is the second large screw part 7.
It is something that

Then, the first rotation 111 and the third rotation 116
The first small threaded part 2 and the first large threaded part 4 are arranged so that they are parallel to each other vertically, and at this time, the thread grooves facing each other are 8 matches the first large threaded part 4 every n pips of the first small threaded part 2, so the first rotating shaft 1 rotates the second rotation so that the matching thread grooves 8 come into contact with each other via the ball 9. It is rotatably held within the case body 10 by a bearing 11 with a set distance from the shaft 3.

In addition, the second rotating shaft 3 and the third rotating shaft 116 (,1, the grass blades are vertically parallel to each other and are on the same line as the axis of the third rotating shaft 6, and the second rotating shaft The second machine screw part 5 of No. 3 and the second human thread part 7 of the third rotating shaft 6 are arranged so as to face each other, and at this time, the facing screw part 8 is the second machine screw part 8 of the third rotary shaft 6. Since the small threaded part 5 matches the second large threaded part 7 every n pitches, the second rotating shaft 3 and the third rotating shaft 6 are connected so that the matching thread grooves 8 abut each other via the ball 9. It is rotatably held in the case body 1o by a bearing 11 with a set interval.
At that time, the first small screw part 2, the first large screw part 4, and the second
Matching screws 8 between the small screw part 5 and the second large screw part 7
Their cross-sectional shapes are such that the balls 9 are in two-point contact η with each of the matching screw grooves 8.

On the other hand, as the respective rotating shafts 1, 3.6 rotate, the positions of the matching screws 8 move sequentially, and the ball 9 moves accordingly. that way,
Since it is necessary to supply the balls 9 to the positions of the thread grooves 8 that are successively matched with each other, the balls 9 that have moved as the thread grooves 8 are moved must be brought into alignment with each other. The screws are circulated so as to be supplied to the positions of the eight screws. In that case, each rotation 1ql + 1.3
6 are arranged vertically, so the circulation groove 20 for circulating the balls 9 is as shown in FIGS. 2 and 3.

Horizontally formed in a substantially elongated shape are arranged between the first rotating shaft 1 and the second rotating shaft 3 and between the second rotating shaft 3 and the third rotating shaft 6, and at the aid of t. , the distance between the balls 9 [Y, (if the balls 9 are located between the matching screw grooves 8, the distance Ml between the matching big screw grooves 8)
, and in the other circulation grooves 20 [, 1,
They are arranged so that they move together.

Moreover, when each rotating shaft 1, 3.6 is arranged as described above, the ball 9 is on the tangent between the first machine screw part 2 and the 'fS1 human screw part 4,
In order to arrange the second machine screw part 5 and the second human screw part 7 on which tangent line, the following structure is constructed.

That is, in the case main body 1o (the first machine screw part storage cavity 13, the first large thread part storage cavity 14, and between the second machine screw +111 storage cavity 15 and the second large thread part storage cavity 16). , a ball position adjustment plate 12 that can be pressed horizontally to sandwich the ball 9 from the lateral direction on the opposite side of the circulation groove 20 is disposed, and this ball position adjustment plate 12 is horizontally pressed into the wreath main body 10 from the lateral direction. It is formed of a plate material of an appropriate thickness that is slidably inserted, and when the tip is pressed into contact with the ball 9, it forms a part of each of the storage cavities 13, 14, 15, and 16, so as to form a part of the corresponding storage cavity. 13, 14. and 15° 16 curvature, and is formed to be tapered approximately wedge-shaped.The ball position adjustment plate 12 is fixed to the case body 10 with screws 18 at the rear end of the ball position adjustment plate 12. The adjustment screw 19 that is threadedly inserted into the adjustment board 17 is formed with a screw (not shown) whose tip abuts and a screw (not shown). The ball position adjusting plate 12 is rotated to press the ball position adjusting plate 12 in the direction of the ball 9, or pulled back in the opposite direction to the ball 9 to hold the ball 9 at an appropriate position. It is something that

In that case, the ball position adjustment plate 12 should be formed so that it can be pressed and pulled back from the direction of JJ (not from the direction of the ball, but also from the opposite direction).
Hole position ii JJ ′r”Ji 12 point ÷ ′t′
I: No form payment (, L is limited as mentioned above and is 1!
For example, as shown in Figure 5, J, o --7 at the tip of the sea urchin.
If a rotating body such as -21 is pivotally supported, it will rotate easily even if the tip of the ball position iも1° adjustment plate 12 is pressed against the ball 9, so smooth power transmission will be possible, resulting in backlash. It is possible to write l without any.

Therefore, for example, the first machine screw part 2 and the CF second machine screw part 5
If the first rotation shaft 1 is rotated as an input shaft with the pitch and pitch circle diameter of the first threaded part/I and the second threaded part 7 set to 6, then the screw ifl'+ Eight national territories are the first
The pitch between the rotating shaft 1 and the second rotating shaft 3 is 16, and if the first rotating shaft is rotated by 1, the second rotating shaft 3 will be rotated by 1!6 times. The pitch between the second rotating shaft 3 and the third rotating shaft lN16 is also 1G. 6 rotates 176 times. Therefore, when C1 first rotating shaft 1 is rotated once, the third rotation of the output shaft is 176 times.
/6 x 1/6, which means that the speed is reduced to 1/3G rotation. Conversely, if the third rotation ff1116 is removed from the input shaft, the first rotation shaft 1, which is the output shaft, will be accelerated by 36 times.Furthermore, if the second rotation 1III3 is removed from the input shaft, the first rotation shaft 1 will be The speed is increased six times, and the third rotary shaft 6 is decelerated 176 times and output to the same low level. Moreover, the first
If the rotary shaft 1 or the third rotary shaft 6 is used as the input shaft, the third rotary shaft 6 or the first rotary shaft 1, which is the output shaft with the highest acceleration/deceleration ratio, will be arranged on the same axis. Then, if the first rotating shaft is used as the input shaft, the second rotating shaft 3 will have 17
Sixth, the third rotary shaft 6 can simultaneously output at a speed reduction ratio of 1730 times, and the third rotary shaft 6 and the input shaft can simultaneously output at a speed increase ratio of 6 times and 36 times. I can do it.

On the other hand, even if the high priest reduction ratio is 1/36 times or 36 times, the first machine screw part 4 and the second machine screw part 7 are different from the first machine screw part 2 and the second machine screw part 5. Since the diameter of the hole requires only 6 times as many holes, it is possible to form it in a very large size. In addition, in this case, regarding the pitch and the big circle diameter, the first large threaded part 4 and the second human threaded part 7 are multiplied by n, which is an integer, with respect to the first small threaded part 2 and the second small threaded part 5. Therefore, the lead angles of the screws 1148 are the same, and the resistance against the C ball 9 is completely 4", so slippage of the ball 9 can be eliminated, and reliable acceleration/deceleration can be achieved. It becomes possible.

In addition, if it is not necessary to arrange the input J axis and the output shaft on the same axis, each rotation 1'1l11, 3.6 may be changed as appropriate instead of arranging them as shown in the front). In this case, each threaded portion 2, 4 . , 5.7 may be changed as appropriate. As mentioned above, if the rotation is not limited to +lq or 3 AC, but if the multi-stage arrangement or (previously) repeated arrangement of the rotating shafts is repeated as appropriate, an even larger increase/deceleration ratio can be obtained.

[Effect of the invention] Since this invention is configured as described above, it is possible to arrange the input shaft and the output shaft on the same axis. However, it is possible to increase/decelerate reliably and at a high ratio without backlash1.
In addition, it enables simultaneous output of increase/deceleration or simultaneous output of different ratios, and can be provided at low cost.

That is, t5, the first rotating shaft 1, etc., which has a small screw part on the outer periphery, the pitch of the small screw part, the pitch of the same integer 8 with respect to the pitch circle diameter, the large screw part with the pitch circle diameter, and the above-mentioned. 2nd rotation Iw1 to turn the same machine screw part to the outer periphery
3. The large threaded part, which is the same as the large threaded part, is made up of a third rotation @ 6 etc. located on the right side on the outer periphery, and the first rotating shaft 1 and the second rotating shaft 3.
and the axes thereof are parallel to each other, and the small threaded part of the first rotating shaft 1 and the large threaded part of the second rotating shaft 3 are made to face each other, and the matching thread grooves 8 abut each other via the ball 9. Rotate as much as possible 11
+1.

Set the interval between the three and rotatably support them, and further,
The third rotating shaft 6 is arranged so that its axis is parallel to the axis of the second rotating shaft 3 and on the same line as the axis of the first rotating shaft 1, and the small coincidence of the second rotating shaft 1113 is arranged. By bringing the screws 8 into contact with each other through the ball 9 and rotatably supporting them, when the first rotating shaft 1 is rotated once, the second rotating shaft 3 is decelerated to one fraction of the above-mentioned integer. At the same time, the third rotating shaft 6 is decelerated to 1/2 of the above-mentioned integer, but since the screw damage ε3 times and the lead angle are also the same, there is no resistance at all to the ball 9 at the lead angle. , the ball 9 is reliably decelerated without slipping at all.

And before i! On the other hand, if the third rotation tl'tll 6 is rotated once through the input shaft, the second rotation shaft 3 will be accelerated to iV + the integer number, and the first rotation shaft 1 will be accelerated to the integer number iV+. (The speed is increased to B. Furthermore, when the second rotating shaft 3 is moved to the input shaft, the first rotating shaft 1 is accelerated to the above-mentioned integer 8, and at the same time, the third rotating shaft 6 is accelerated to n. The speed is decelerated to one integer, making it possible to output simultaneous acceleration and deceleration.
Ru. In addition, by making the ratio of the pip and pitch diameters of each small screw part and large screw part the same, the first rotating shaft 1 and the third
Rotation@6 Since any axis can be arranged on the same line, it facilitates the installation when assembled into a machine and contributes to the simplification of the machine.

However, it is possible to continuously supply the balls 9 to the abutting position between the first rotating shaft 1 and the second rotating shaft 3, and the abutting position between the first rotating shaft 1 and the third rotating shaft 11b6. At the same time, by forming the supplied balls 9 so that they can be adjusted so as to be disposed on tangent lines of the directions of the respective screw portions, it is possible to reliably and smoothly increase/decelerate continuously. Adjustment eliminates backlash, so there is no error in forward and reverse rotation, and since no gears are used, there is no gear cutting process, and the structure itself is simple, so it can be provided at a very low cost.

As explained above, according to the present invention, it has a very simple structure, enables reliable acceleration/deceleration without backlash, and has a high acceleration/deceleration ratio of 7:3. In addition, it is compact in terms of drawing, and 1. It is capable of outputting simultaneous acceleration and deceleration, or simultaneous output at different ratios.Furthermore, since it uses gears and has 4 teeth, Since there are no two culms, it can be manufactured at low cost, and the input and output shafts can be arranged on the same line, so it does not take up much space when installed on various machines, etc., so it can be installed in any location. It has excellent effects such as:

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention (Fig. 1 is a front sectional view, Fig. 2 is a sectional view taken along the arrow A in Fig. 1, and Fig. 3 is a sectional view in Fig. FIG. 4 is an enlarged side view of the case body, and FIG. 5 is an enlarged sectional view of main parts of another embodiment.

Claims (1)

[Claims] 1. A first rotating shaft having a machine screw part on the outer periphery, a pitch f of the machine screw part, and a pitch that is both the same integral multiple of the pitch circle diameter,
A second rotating shaft that has a human threaded part with a big circle diameter and a small threaded part that is the same as the small threaded part described in 11 on the outer periphery, and a 31G1 rotating shaft that has the same large threaded part as the large threaded part on the outer periphery. and a first rotating shaft and a second rotating shaft, the axes of which are parallel to each other, and a small threaded portion of the first rotating shaft and a large threaded portion of the second rotating shaft are made to face each other and are matched with each other. ? iI! A third rotation shaft is supported so that the rotation shafts can rotate together by setting an interval of rotation φλQkh so that the two abut each other through the balls, and further, a third rotation shaft is supported so that its axis is parallel to the axis of the second rotation shaft. and the small threaded part of the second rotating shaft and the large threaded part of the third rotating shaft are arranged so that they are on the same line as the axis of the first rotating shaft, and the matching screws are aligned. The contact position between the first rotating shaft and the second rotating shaft and the position between the second rotating shaft and the third rotating shaft are rotatably supported through a ball.
In addition to making it possible to continuously supply holes in positions where
The power transmission device is characterized in that the supplied balls are arranged so as to be adjustable as appropriate so as to be arranged in a line between the opposed threaded portions.