JPH0211960A - Speed adjuster utilizing ball - Google Patents

Abstract

PURPOSE:To aim at the promotion of lightweightiness by installing each outer guide case at both sides of a ball protective case and a groove screw gear in between, while unifying these outer guide cases to a part where the groove screw gear and a speed adjustable gear are engaged with each other. CONSTITUTION:A ball protective cover 9 is attached to an outer circumferential part of a groove screw gear 1, and outer guide cases 10 are attached thereto so as to hold both sides of this protective cover 9 and the groove screw gear 1 in between. A part, where the groove screw gear 1 and a speed adjustable gear 3 are engaged with each other via balls, is covered by an inner guide case 11, and a bearing consisting of an oil seal, a bearing and a bush is interposed between both guide cases 10, 11 and a shaft part 2 of the gear 1 and thereby this space is sealed up. Consequently, only a main part where balls are moved is covered and hermetically sealed, and since most of the speed adjustable gear 3 is exposed open, miniaturization and lightweightiness can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Application The present invention relates to an acceleration/deceleration mechanism that engages a grooved screw gear driven by an input shaft and an acceleration/deceleration gear metal to increase/decelerate speed by a ball that moves while moving. Since only the main parts of the mechanism are effectively sealed to improve dustproofness and oil retention, and it can be made into a compact unit, it can be widely used as an increase/decelerator for various machines.

(2) Conventional technology Conventional speed increase/deceleration mechanisms take measures to increase or decrease speed by changing the rotation ratio of a worm gear, an ohm wheel, an umbrella gear, etc. all rotated by a motor. recent years,
An increasing/decelerating mechanism has been developed that uses a grooved screw gear entirely and meshes balls arranged in a continuous manner in the groove instead of teeth to transmit rotation to a grooved wheel attached to an increasing/decelerating output shaft.

Figure 8 shows an acceleration/deceleration mechanism using all the balls developed by the present inventor and related to Japanese Patent Application No. 61-304795.
A helical ball raceway screw groove 5' in which the screws are continuously arranged.
ff: The grooved screw gear 1 provided and the gear 3 for increasing/decelerating provided with a plurality of ball raceway grooves 7 are brought close to each other, and the gear for increasing/decelerating is attached to the output shaft through the grooved screw gear 1 attached to the input shaft and the balls 8. 3 is engaged to complete a predetermined increase/deceleration rotation.

In this acceleration/deceleration mechanism G, a ball protection cover 9 is provided around the outer periphery of the groove screw gear 1 to prevent the balls 8 fitted into the ball raceway screw grooves 5 from jumping out and falling off. In order to prevent dust and retain oil, the grooved screw gear 1, the acceleration/deceleration gear 3, and the poll protection cover 9 are all covered by a strong overall case 18 shaped to fit these parts, and the input shaft 2 and output shaft 20 sides are All 1 cover plate each
It was designed to be sealed at 9.

(3) Problems to be Solved by the Invention In conventional speed increase/decrease gears, the ball-based increase/decrease mechanism is covered with a ball protective cover and the entire mechanism is covered with a case or cover plate to make it airtight. Like gearboxes that use ohm wheels, the mechanical parts are heavy and large, which of course has the drawback of increasing costs, and it has been difficult to reduce costs by making them smaller and lighter units.

(4) Means for Solving All Problems The present invention, in an increase/decelerator using balls, effectively covers and seals only the main part where the balls move, thereby completely improving the dustproofness and oil retention of the mechanism part. At the same time, by exposing most of the acceleration/deceleration gears from the entire case, it can be made into a unit, making it possible to reduce the size and weight. That is, a grooved screw gear that is rotationally driven by an input shaft is provided with a ball raceway screw groove that is continuous through a full circulation path at the end and start end, and a plurality of ball raceway grooves are provided in an accelerating/decelerating gear that is placed close to the grooved screw gear. Balls arranged in a continuous manner are loaded into the ball raceway screw groove so as to fit into the ball raceway groove adjacent to the screw gear, and the balls are interposed between the groove screw gear and the increase/decrease gear, and the increase/decrease speed close to the groove screw gear is inserted. In a speed increase/decrease gear that uses balls, in which a ball protection cover is fully attached to the outer periphery of the groove screw gear except for the speed gear side, an outer guide case is fully installed on both sides of the ball protection cover and the groove screw gear, and the groove screw gear and increase/deceleration The entire inner guide case is integrated with the outer guide case on the outer periphery of the part where the gear engages through the ball, and an oil seal, bearing, A grooved screw gear with a ball loaded with a bearing consisting of a bush, etc., and the meshing part by the ball are completely sealed, and one part of the circular engagement part provided on both sides of the acceleration/deceleration gear is attached from both sides by the gear mounting screw. Sandwiched,
This is an increase/decrease gear that makes full use of balls and is characterized by a rotatably attached increase/decrease gear.

(5) Function The present invention covers the grooved screw gear with a ball protection cover attached to the outer periphery of the grooved screw gear, and an outer guide case attached to sandwich both sides of the ball protection cover and the grooved screw gear, and increases and decreases the grooved screw gear. The part where the speed gear meshes through the ball is covered by an inner guide case, and a bearing consisting of an oil seal, bearing, bushing, etc. is entirely interposed between the outer guide case, the inner guide case, and the shaft of the grooved screw gear. and sealed. That is, the outer periphery of the grooved screw gear loaded with balls is completely sealed by the outer guide case except for the meshing part 2, and the outer periphery of the meshing part with the speed-up/deceleration gear is sealed by the inner guide case.

Also, a part of the gear for increasing/decelerating comes into contact with the meshing part, and since this gear for increasing/decelerating is supported by the gear mounting screws inserted into the circular engaging parts on both sides, the loaded balls will not fall out. Covered without incident. Therefore, the dust-proofing and oil-retaining properties of the mechanical parts are increased, noise generation is completely prevented, acceleration and deceleration rotation is smoothed, and wear of the meshing parts and balls is reduced.

(6) Examples Next, the present invention will be explained using examples. @ In Figure 1, Figures 2, 3, and 4, 1 is a grooved screw gear attached to an input shaft 2 driven by a motor, and 3 is a grooved screw gear mounted on an input shaft 2 driven by a motor, and 3 is an output shaft hole 4 to which the rotation of the grooved screw gear 1 is transmitted. This is an increasing/decelerating gear that rotates the output shaft fitted into the motor at a predetermined increase/reduction ratio. The grooved screw gear 1 is provided with a helical ball raceway threaded groove 5, and the terminal end and the starting end of the ball raceway threaded groove 5 are connected by a circulation path 6.

On the other hand, the increasing/decelerating gear 3 is provided with a plurality of ball raceway grooves 7 corresponding to the ball raceway screw grooves 5. Balls 8 are continuously aligned and loaded in the pole raceway screw groove 5 so that they can freely transfer and move.

The ball 8 in the ball raceway screw groove 5 fits into the ball raceway groove 7 of the adjacent gear 3 for increasing/decelerating, and the groove screw gear 1 and the gear 3 for increasing/decelerating engage with each other via the ball 8. The outer periphery of the groove screw gear 1 is A ball protection cover 9 is installed to prevent the balls 8 from flying out and falling off, except for the side near the increasing/decelerating gear 3.

Therefore, when the grooved screw gear 1 rotates, the increasing/decelerating gear 3 that meshes with the ball 8 rotates at a predetermined increasing/reducing ratio. At this time, the continuous ball 8 loaded in the ball raceway thread groove 5 moves while rolling due to contact with the ball raceway groove 7 of the gear 3 for increasing/decelerating, and circulates sequentially from the end of the ball raceway thread groove 5. The ball passes through the path 6 and emerges from the starting end, moves again through the ball raceway screw groove 5, and transmits rotation to the gear 3 for increasing/decelerating according to the increasing/decelerating ratio.

In the ball-based speed increaser/deceleration gear configured in this way,
An outer guide case 10 is attached so as to completely sandwich both sides of the grooved screw gear 1 and the ball protection cover 9, and the grooved screw gear lt with the ball 8 loaded in the ball raceway screw groove 5 on the outer periphery is covered, and the grooved screw gear 1 and the speed-up/deceleration are connected to each other. An inner guide case is attached to the outer periphery of the part where the gear 3 meshes with the ball 8 via the ball 8, and is integrated with the outer guide case 10 using case mounting screws 16 to cover the outer periphery of the meshing part. In addition, the outer guide case 10, the inner guide case 11, and the shaft portion 1 of the groove screw gear 1
A bearing 12tl consisting of an oil seal, a bearing, a bushing, etc. is interposed between the groove screw gear 1 and the gear for increasing/decelerating 3 to cover the outer periphery of the meshing portion with the gear 3.

Furthermore, an annular or circular engagement recess 15 is provided on both sides of the C acceleration/deceleration gear 3, and a part of the circular engagement recess 15 is inserted from both sides with the gear mounting screw 17, so that the acceleration/deceleration gear 3 rotates. Since the ball 8 is supported and mounted freely, the loaded ball 8 will not fall out (and the engagement portion by the ball 8 will be completely sealed).

Fig. 5, Fig. 6, and Fig. 7 show the shaft portion 13 of the gear 3 for increasing/decelerating.
This is an alternative embodiment of the present invention which has a cylindrical shape, and a straight groove 14 in the axial direction is provided in the cylinder as shown in the left half of FIG. 6, and it fits into the straight groove 14 during use. The input shaft can be easily inserted by inserting the input shaft provided with the protrusion.

Therefore, this embodiment has the advantage that it can be further miniaturized and unitized.

(7) Effects of the Invention The present invention provides an outer guide case and an inner guide case in a mechanism in which the rotation of a grooved screw gear attached to an input shaft is transmitted to a gear for full increase/deceleration by balls that are arranged in a continuous manner and move while rolling. In addition to covering the entire surface of the ball orbit thread groove in which the balls move, the bearings interposed between the outer and inner guide cases and the shaft of the grooved screw gear can easily seal only the important parts of the mechanism. In addition, since the gear attachment screw is attached to the meshing part so that the acceleration/deceleration gear can be easily removed, it prevents the loaded balls from falling off, and further improves the sealing of the meshing part to improve dust-proofing and maintenance. It has the effect of improving oil properties, and making it possible to be smaller and unitized compared to conventional ball-based increasing/reducing machines, making assembly and handling easier during use, and significantly reducing production costs.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of one embodiment of the present invention, and in Fig. 2, the left half is a sectional view taken along line BB' in Fig. 1, and the right half is taken along line AA' in Fig. 1.
3 is a sectional view of section c-c' in FIG. 1; FIG. 4 is a bottom view of FIG. 1; FIG. 5 is a vertical sectional view of another embodiment of the present invention; In the figure, the left half is a sectional view of section DD' in FIG. 5, and the right half is a section sectional view of section E-E' in FIG. 5.
FIG. 8 is a longitudinal sectional view of a conventional speed-up/deceleration mechanism using balls. In the figure, 1... Groove screw gear, 2... Input shaft, 3...
Acceleration/deceleration gear, 4... Output shaft hole, 5... Ball raceway screw groove, 6... Circulation path, 7... Ball raceway groove, 8...
...Ball, 9...Ball protective cover 10...
Outer guide case, 11... Inner guide case, 12.
...Bearing, 13...Shaft part, 14...Straight groove, 1
5...Circular engagement recess, 16...Case mounting screw,
17... Gear mounting screw, 18... Overall case,
19... Lid plate, 20... Output shaft.琲／ Prison calculation 3 diagram 1tl! (Q l engineering, ;:' f inside, -2:2 L
J7: 2; 1 hole 4/7: Gear attached pheasant procedure amendment (method) 1. Indication of the case 1988 Patent Application No. 161409 2. Name of the invention Speed reducer using all balls 3. Amendment t Relationship with cases involving persons who commit crimes

Claims (1)

[Claims] A grooved screw gear that is rotationally driven by an input shaft is provided with a ball raceway screw groove whose terminal end and start end are connected by a circulation path, and a plurality of ball raceway grooves are provided in an accelerating/decelerating gear that is placed close to the grooved screw gear. Balls arranged in a continuous manner are loaded into the ball raceway screw groove so as to fit into adjacent ball raceway grooves, and the balls are interposed between the groove screw gear and the acceleration/deceleration gear, and the acceleration/deceleration gear is adjacent to the groove screw gear. In a speed increase/decrease gear that uses balls with a ball protection cover attached to the outer periphery of the groove screw gear except for the gear side, an outer guide case is installed on both sides of the ball protection cover and the groove screw gear, and the groove screw gear and the speed increase/deceleration gear are An inner guide case is attached to the outer periphery of the part where the gears mesh through the balls, and is integrated with the outer guide case, and oil seals, bearings, bushes, etc. are installed between the outer guide case, the inner guide case, and the shaft of the grooved screw gear. A bearing consisting of the groove screw gear loaded with the ball and the engagement part by the ball are sealed, and a part of the circular engagement recess provided on both sides of the speed increase/decrease gear is clamped from both sides with the gear mounting screw. This is an increase/decrease gear that uses a ball and is characterized by a rotatably mounted gear for increasing/decelerating.