JPH0143862B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roller screw. This is because the patent application relating to the applicant's earlier invention is
The principle invention is a roller screw disclosed in the specification and drawings of No. 57-101124, specifically, a roller screw in which a large number of rollers are freely rotatably supported on a helical winding of a rotating shaft. This is a further development, and by connecting and supporting multiple shafts in a chain so that they can be bent and rotated, this type of roller screw can be used for a variety of purposes. be.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, in FIGS. 1 and 2 showing the principle diagram of the roller screw S according to the present invention, and FIG. It has a cylindrical shape and is normally rotated in forward and reverse directions. 1 and 2 are rotating shafts protruding from both upper and lower ends of the shaft A, and 3 are a number of recesses (in the case of a solid shaft) or holes (in the case of a solid shaft) bored at equal intervals on the helical winding H of the shaft A. In the case of a hollow shaft), 4 is a ring member such as a bearing or bearing metal fitted and supported in the recess 3 or hole;
Reference numeral 5 denotes a roller which is supported by a bearing on a ring member 4 so as to be able to freely rotate, and in the case of FIG. . In the case of FIG. 3b, a roller shaft 6 is fitted and supported by the ring member 4, and the roller 5 is fitted and keyed onto the roller shaft 6.
In the case of FIG. 3c, unlike the cases of FIGS. 3a and 3b, the ring members 4 are fixed directly on the helical winding H of the shaft body A at equal intervals with welding, screws, etc. Rollers 5 such as a and b are supported by bearings so that they can freely rotate. In the case of Fig. 3 d, a hole 3 a is bored on the helical winding H of the shaft body A of the hollow shaft, and the ring member 4 is fitted into the hole 3 a, and the ring member 4 shown in Figs. The roller 5 is supported so as to be freely rotatable. In this way, one shaft body A is constructed in which a large number of rollers 5 are supported over approximately one pitch on the helical winding H. J is a universal joint that connects and supports a plurality of shaft bodies A, A1 in a chain, and connects and supports a plurality of shaft bodies A, A1 that are adjacent to each other.
Forked connecting pieces 7, 8 are fixed to rotating shafts 1, 2 of
are connected as a pivot, and the roller screw S on the driving side is configured to function so as to be bendable and rotatable. Reference numeral 11 denotes a guide rail which is fixed to one side of the shafts A and A1, and is usually not only linear but also bent or swiveled in the vertical, horizontal, or inclined direction. , arranged in a curved shape, etc. Reference numeral 12 denotes protrusions of an appropriate width that are protruded from the guide rail 11 at equal intervals, and the upper surface of the protrusions 12 is configured as an engagement surface 13 with the roller 5. The engaging surface 13 may be a spirally curved surface 13a having the same slope as the helical angle Θ of the roller 5 provided on the helical winding H, as shown in FIG. 4a when viewed from the side, or , as shown in FIG. 4b, it is formed into a simple inclined surface 13b having the same helical angle Θ. In addition, when the protrusion 12 having the engagement surface 13 with the roller 5 and the spirally curved surface 13a or the inclined surface 13b is viewed from above, the shaft A, A1 side has a semi-arc shape as shown by the solid line in FIG. Either the protrusion 12a is formed in a recessed manner and both sides thereof are cut off or bent downward, or the protrusion 12b is formed into a substantially rectangular planar shape as shown by the imaginary line in the figure. Moreover, such a protrusion 12 is shown in FIG.
As shown in FIG. 6b, the channel-shaped rail 11 may be cut and raised to either the inner concave portion 11a or the outer portion 11b and protrude integrally, or it may extend over the inner wall surface 11c of the semicircular rail 11 as shown in FIG. 6c. Alternatively, as shown in FIG. 6d, a rack may be provided protruding from one side surface 11d of the square steel rail 11, or the upper surface may be provided with a roller 5 as shown in FIG. 6e.
The angular protrusion 14 and the sixth
As shown in FIG.
It can also be fixed by welding to one side of 1 or by bolts, nuts, screws, etc. With this, the other guide rail 11 is configured and the roller screw S functions.

In order to make the roller screw S having the above structure function, first, the shafts A and A1 on the driving side are supported so as to be rotatable in forward and reverse directions and movable, and the other guide rail 11 is fixedly supported so as not to be movable. Shaft body A, A
A roller 5 is arranged and supported in a spiral manner on the outer peripheral surface of the roller 1,
Engagement surface 13 of protrusion 12 provided on guide rail 11
are engaged in a rolling manner. On top of that, rotate axis 2
Drives the geared motor connected to the motor and other prime movers in forward rotation. Then, the roller 5 of the roller screw S rolls along the low step part 13L to the high step part 13H of the engagement surface 13 by an arbitrary width of the protrusion 12,
The next and subsequent rollers 5 are continuously engaged in a rolling manner, so that the entire roller screw S smoothly rotates along the guide rail 11 and moves upward or forward. Conversely, when the rotating shaft 2 is driven in the reverse direction, the rollers 5 of the shaft bodies A and A1 move from the high and low parts 13H of the engagement surface 13 to the low step part 13.
It rolls along L, and in this way the roller screw S
A total descending or retracting movement is performed.

In the above case, the guide rail 11 was explained assuming a straight line, but if the guide rail 11 is bent in the middle or if the bent guide rail 11 is to be moved, such bending may be necessary. The universal joint A between the shaft bodies A and A1 is bent along the portion or the curved portion, and the driving force is smoothly transmitted as the universal joint A is meshed and rotated.

A case is shown in which the roller screw S functioning as described above is applied to a stair climbing device that is driven to move in any direction of inclination, and is suitable for, for example, a disabled person to safely ascend and descend stairs while sitting in a wheelchair. In FIGS. 7 and 8, 16 is an ascending/descending staircase with an arbitrary inclination, 17 is a wall body on the side of the staircase 16, 18,
Mounting brackets 19 are arranged and fixed at the upper and lower parts of the wall body 17, and are provided at appropriate intervals in the running direction. Among them, the upper bracket 18
The channel-type guide rail 11 is connected to the staircase 1.
The guide rail 11 is provided with protrusions 12 having engaging surfaces 13 projecting downward at equal intervals. In addition, a channel type guide rail 2 is attached to the lower bracket 19.
0 is arranged parallel to the slope of the staircase 16 and fixes its back surface. Reference numeral 21 is a plate-shaped side frame, and a pedestal 22 is fixedly supported on the outer side of the lower part thereof. Reference numeral 23 denotes a plate-shaped support stand fixedly protruding outward from approximately the center of the side frame 21;
It is arranged parallel to the upper side of the guide rail 20. Reference numeral 24 denotes a plurality of shaft bodies A, A whose one side part is fixedly supported on the side frame 21 and whose lower part is fixedly supported on the support stand 23.
1, A2 bearing stand, which is disposed at the upper end and middle part of the support stand 23. As a result, the rollers 5, which are spirally arranged on the outer peripheral surfaces of the respective shaft bodies A, A1, and A2, are engaged with and supported by the protrusions 12 of the guide rail 11 at required intervals. 25 is a prime mover such as a geared motor installed and fixed at the lower part of the support base 23;
26 is a safety brake device installed between the rotating shaft of the prime mover 25 and the rotating shaft 2 of the shaft body A, 27 is a support shaft protruding from the lower part of the side frame 21 at a required distance, and 28 is a support shaft. It is a roller supported at the tip of the guide rail 27, and is configured to be freely rotatable along the inner recess of the guide rail 20. 29 is guide rail 2
Rolled mats 30 and 31 of the roller 28 fixedly installed and fixed at the top and bottom of the inner recessed portion of the roller 28 are rollers arranged at the upper and lower parts of the roller 28 portion, among which the pair of upper rollers 30 are as follows: It is supported by a bearing on the bottom support shaft of the support stand 23, and the upper part of the guide rail 20 is clamped and supported. Reference numeral 32 denotes a support bracket fixedly protruding from the lower part of the side frame 21. A pair of lower rollers 31 are supported by bearings on its upper support shaft, and the lower part of the guide rail 20 is clamped and supported. 33 is a handrail erected and fixed on the outside or both sides of the frame 22;
34 is a cover that covers the driving portion.

Then, the disabled person sitting in the wheelchair pushes the wheelchair up onto the pedestal 24, and then drives the motor 25 in normal rotation. Then, the shafts A, A1, and A2 connected and supported in a chain via the safety brake device 26 rotate, and at the same time, the rollers 5 engage with the engagement surface 13 of the protrusion 12 one after another and roll. The entire movable frame F including the roller screw S on the driving side, the prime mover 25, the pedestal 22, etc. is guided by the guide rails 11, 20, etc. and moves directly, thereby moving the pedestal 22 to the top of the stairs 16. Move up to the top. At this time, rollers 30 and 31 disposed on both upper and lower sides of the guide rail 20
The rollers 28 rolling in the inner recessed portions of the guide rails 20 prevent the entire moving frame F from lateral vibration, and ensure smooth vertical movement thereof.
Furthermore, by driving the prime mover 25 in reverse,
The entire moving frame F is lowered in the same manner as described above.

In the case of the above application example, the side frame 2
1. The case has been described in which the entire movable frame F including the pedestal 22, support 23, etc. is directly reciprocated in the inclination direction by the roller screw S, but it can also be moved in either the vertical or horizontal direction. Needless to say, the present invention can be applied to various applications as a drive device for a conveyance device that moves back and forth.

In particular, as in the present invention, a plurality of shaft bodies A, A1, A
2 is a roller screw S connected and supported in a chain by a universal joint J, a curved rail part is formed in the middle of the linear guide rail 11, or the entire guide rail 11 is curved. In such cases, the present invention can be usefully applied as a drive device for smoothly moving a required moving frame F along the curved guide rail. For example, Figures 9 and 10
In the figure, reference numeral 35 denotes a substantially cylindrical guide rail with an opening 36 formed on one side, and is composed of a straight rail portion 35a and a curved rail 35b. Protrusions 12 as shown in Figure c are formed at required intervals. The roller screw S according to the present invention is engaged with and supported by such a guide rail 35, and the support stand 23 and the pedestal 2 are connected to the bearing stand 24 protruding outward from the opening 36.
2. Moving frame F consisting of side frames 21, etc.
After configuring this, the roller screw S is made to function in the same way as in the case of Application Example 1, thereby ensuring smooth movement of the movable frame F along the guide rail 35. In addition, the guide rail 35
Alternatively, about three guide rails 11 may be arranged as shown in FIG. 11, and these may be bent and fixed as shown in FIG. 9.

In the case of the present invention described above, the roller 5 of the roller screw S and the projections 12 of the guide rails 11, 35 are configured as a flat horizontal surface as shown in FIGS. As shown in Figures a and b, the roller 5 whose outer circumferential surface is a conical surface and the protrusion 12 whose tooth surface is an inclined surface mesh with each other, and as shown in Figure 3b,
Although the configuration shown in d does not change the gist of the present invention in any way.

In the present invention, a large number of rollers are provided on the helical winding of the rotating shaft as described above, and a plurality of the shafts are connected and supported in a chain to form a roller screw that can be bent and rotated freely. It is possible to maintain and ensure smooth rotational force mediated by the rollers, and by simply supporting the necessary minimum number of rollers on the helical winding of the shaft so that they can freely rotate, the operating efficiency of each roller can be achieved at an excellent level. As a result, it can be widely applied to various technical fields. Moreover, in the case of the present invention, since a plurality of shaft bodies are connected and supported so as to be bendable and rotatable, it goes without saying that when the guide rail is straight,
It brings about various effects such as being able to effectively deal with any case of bent shape, curved shape, loop shape, etc.

[Brief explanation of drawings]

Fig. 1 is a plan view of the roller screw, Fig. 2 is a front view thereof, and Figs. Indicates the condition. Figures 4a and 4b are enlarged side views showing the side forms of the protrusions, in which figure a shows a case in which the engagement surface with the roller is a spirally curved surface, and figure b shows a case in which the engagement surface with the roller is a merely inclined surface. . FIG. 5 is an enlarged plan view showing the planar form of the roller and the protrusions, FIGS. 6 a to f are perspective views showing various modifications of the rail member and its protrusions, and FIGS. 7 and 8 show the present invention as a staircase part. FIG. 7 is a side perspective view, FIG. 8 is an X-arrow view of FIG. 7, and FIGS.
Figure 0 is a front view and plan view of main parts showing the second application example, and Figure 11 is a plan view showing a state in which three guide rails are arranged around the roller screw instead of the guide rail in Figure 10. , FIGS. 12a and 12b are views showing modifications of FIGS. 3b and d. Code list, S... Roller screw, H... Helical winding, A... Shaft, J... Universal joint, 1, 2...
Rotating shaft, 3... recess or hole, 4... ring member, 5... roller, 6... roller shaft, 7, 8...
Connection piece, 9, 10...pin, 11, 35...guide rail, 12...protrusion, 13...engaging surface, F...
...Moving frame.

Claims (1)

[Claims] 1. A large number of rollers are freely rotatably supported on a helical winding of a rotating shaft body, and a plurality of the shaft bodies are connected and supported in a chain so that they can be bent and rotated freely. Characterized by Roller Screw. 2. The roller screw according to claim 1, wherein the roller is bearing-supported in a recess or hole of a shaft body.