JPS6150176B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device with a linear movement mechanism based on the screw principle.

Linear motion mechanisms using screws are widely used in a variety of equipment, equipment, and their constituent parts because the higher the screw precision, the more precise and fine the movement, and the ability to obtain relatively strong axial thrust. There is. Conventionally, in the combination of screw mechanisms intended for linear motion, in most cases, the male screw becomes a rotational drive member that restricts axial movement, and the female screw that is screwed into this is restricted from rotation and moves in the axial direction. It becomes a driven linear motion member.

However, high-precision machining of a single male thread over the required range of linear motion becomes cumulatively more difficult the longer it is due to causes such as deflection in the intermediate section, and this increases the cost. The scope of application of the linear motion mechanism is limited to relatively short strokes.

The present invention enables linear motion over a long distance, with the female thread side serving as a fixed member that neither moves nor rotates in the axial direction, and the male thread side serving as a linear motion member that is rotationally driven and moves in the axial direction. A driven member that is to be linearly moved in relation to the male threaded member is restrained from rotation, rotatably supports the male threaded member, and is prevented from moving relative to the male threaded member in the axial direction at least in the load direction, Also, it is necessary to rotate the male threaded member.
Relevant as such.

In the present invention, the female thread member is based on a thread of a constant pitch and a constant diameter centered on the axis.
While the male threaded member has a spiral over the entire circumference, the spiral exists only in a range of less than half the circumference, that is, partial helical grooves are arranged in the longitudinal direction of the axis intermittently on the concave surface of the arcuate cross section of less than a semicircle. It is formed by
The relationship of the linear motion driven member to the female screw member is made from the side opposite to the side where the linear motion driven member is screwed with the female screw member having a circumference of less than half a circumference, that is, the open side of the female screw member having no substantial spiral of more than a half circumference.

Each partial helical groove of the internally threaded member is such that at least the edge on the side receiving the axial load from the linearly moving driven member is aligned with the reference helical thread, is formed on an edge surface with a constant edge width, and As will be described later, in order to prevent the male threaded member from separating from the open side of the female threaded member and to maintain the threaded relationship between both threaded members by the threaded member itself, the female threaded member has an engagement wall on the rear surface of the edge. A concave groove is formed to provide a. An example of an internally threaded member that satisfies this condition is to punch out inclined groove holes corresponding to partial spiral grooves in the central zone along the longitudinal direction of the strip material, and then bend the central zone. It can be easily made by forming a concave surface and forming both side bands at the desired connecting parts, and the entrance and exit openings of the spiral of the male threaded member are formed in each part of the connecting part of the male threaded member at the connecting parts on both sides following the concave surface of the female threaded member. Provided following the groove. In order to make a long female threaded member, it is possible to install unit female threaded members of the same length in the axial direction so that the mutual continuity of the threads is maintained, which is effective without any manufacturing restrictions. The length can be increased.

On the other hand, a male threaded member has a spiral protrusion along the reference thread formed on the circumferential surface of a cylindrical body that is shorter in the axial direction than that of a female threaded member, and the axis of the male threaded member and the female threaded member coincide. In order to maintain the screwed state by the threaded member itself, the male threaded member is provided with an engaging portion on the outer edge of the helical protrusion that engages with the engagement wall surface of the female threaded member.

When the edge surface of the partial helical groove of the female threaded member and the helical protrusion of the male threaded member slide into contact and move relative to each other, sliding frictional resistance acts. In order to use rolling friction as the frictional resistance between the threaded members, in the present invention, the spiral of the male threaded member is formed by a large number of roller rows. That is, a large number of rollers protruding from the circumferential surface of the cylindrical body and supported so as to freely rotate around the radial axis of the cylindrical body are installed in a row along a spiral path. In this case, it is sufficient that each roller in the roller row is arranged so as to be in contact with the reference thread in the load direction, and under this condition, the rollers do not need to have the same diameter. When the male threaded member is the roller threaded body described above, the male threaded member engagement portion is formed as a protruding annular flange at the outer end of the roller.

Hereinafter, the present invention will be explained specifically and in detail with reference to embodiments shown in the accompanying drawings. The basic components of the present invention include an immovable female screw member that is fixed to a fixed part, a male screw member that rotates while maintaining a threaded relationship with the female screw member, and a linearly movable driven member that maintains a constant relationship with the male screw member.

Figures 1 and 2 show a female threaded member 1 according to the present invention.
An example is shown in which, with a screw thread T having a constant diameter D and a constant pitch p centered on the screw axis Partial spiral grooves 3 are formed in the remaining concave surface 2 having an arcuate cross section of less than half a circumference, and are arranged in the axial direction. When the load direction is downward as shown by the arrow P in the figure, the lower edge 4 of the partial helical groove receiving the load is aligned with the reference thread T, and is formed on an edge surface with a constant edge width. Since it is necessary to prevent the male threaded member (described later) from separating from the open side of the female threaded member 1 and to maintain the threaded relationship between both threaded members by the threaded member itself, an engagement wall 5 is provided behind the helical groove edge 4. A concave groove is formed. The wings 6 adjoining the central concave zone 2 of the internally threaded member 1 on both sides are provided with helical entry ports 7 and exit ports 8 of the male threaded member following each partial helical groove 3 .

Such an internally threaded member 1 has an inclined groove hole corresponding to a partial spiral groove 3 in front of a central zone along the longitudinal direction of the strip material, and an entrance port 7 and an exit port 8 at both ends thereof.
Openings corresponding to the above are formed in a row by punching, and then the wing part 6, the girder part 9 connected thereto, and the mounting seat 10 are formed by bending, and the mounting seat is fixed to the fixed part. It can be easily made by drilling holes 11. However, the internally threaded member 1 can be manufactured relatively easily not only by machining a strip material but also by machining a long material.

To make an even longer female threaded member, unit female threaded members each having a partial length may be connected and attached in the axial direction. At this time, the mutual continuity of the reference threads of the two connected members is maintained Any desired length can be achieved by repeating this connection with care. Since the unit screw member can be made to have a reasonable length, there is no difficulty in manufacturing it.

FIGS. 3 and 4 show an example of a male threaded member 12 that is screwed into the female threaded member 1, and a spiral is formed along the same reference thread T. This male threaded member 12 is constructed by arranging a group of many rollers 16 along a spiral over at least the entire circumference on the circumferential surface of a relatively short cylindrical body 15 fixed on a rotating shaft 13 by a key 14. Each roller 16 has a cylindrical body 15
The roller base 17 is mounted on ball bearings 18 and 19 so as to be rotatable around the radial axis Z.
A snap spring 21 is attached to the outer end of the outer spherical bearing 18.
is fitted into the receiving groove 22 to be fixed and prevented from coming off.
Each roller 16 protrudes outward from the circumferential surface of the cylindrical body 15, and under the downward load direction of the arrow P, the reference thread T contacts the lower edge side of each roller in the roller row in a tangential manner. As long as this relationship between the load direction and the thread is maintained, the rollers 16 do not need to have the same diameter.

In order to maintain the screwed state in which the axis of the male threaded member 12 and the axis of the female threaded member 1 coincide with each other by the threaded member itself, the outer end of the roller 16 is attached to the outer end of the female threaded member 1.
A protruding annular flange portion 23 is provided as an engaging portion that engages with the engaging wall 5 of the spiral groove edge portion 4 . As shown in FIG. 6, the diameter of the roller 16 is d1, and the diameter of the collar 23 is d.
2 and the width W of the partial helical groove 3 of the internally threaded member 1 is set to be slightly larger than the sum of the roller diameter d1 and the width w of the flange 23, then the roller 16 rolls on the lower edge 4 of the helical groove 3. When doing so, the flange 23 is prevented from sliding into contact with the rear wall 5' of the upper edge of the spiral groove, and in this case, the roller 16 is not pulled out of the spiral groove 3, so that the locking function is maintained. Although such a large-diameter flange-like engagement portion 23 is present at the tip of each roller 16, both threaded members 1 and 12 are screwed together when the groove width W of the spiral groove 3 is larger than the diameter d2 of the flange portion 23. This can be done by fitting and latching from the open side of the female threaded member 1. When making the groove width W smaller than the flange diameter d2 to maintain the locking function, screw the male threaded member 12 from the end of the female threaded member 1 or from the end from which the adjacent unit female threaded member has been temporarily removed. Can be screwed together. Alternatively, the cylindrical body 15 is coaxial with the female threaded member 1, and each time one roller 16 is attached, the rotating body 15 is
by rotating the mounting roller 16 from the entrance 7 to the spiral groove 3.
By repeatedly entering behind the
Screwing can be performed. Male thread member 12
In addition to the outer end flange 23, the roller 16 has an inner end flange 2 in case the roller 16 is pressed toward the female threaded member 1.
3' can be provided.

FIG. 5 shows a device in which an elevator is chosen as an example of the linear motion driven member 24 and is combined with the above-mentioned screw mechanism. The linear motion driven member 24 is associated with the male threaded member 13 from the open side of the female threaded member 1, and rotatably drives the male threaded member 12.
It is a member that does not rotate or move relative to each other, at least in the direction of the load, and in the case of an elevator, its gravitational load acts downward when moving up or down.

An elongated female screw member 1 is installed in a vertical arrangement along a fixed support wall 25 of a building. Male thread member 1
2 is screwed into a female threaded member, and this male threaded member 12 is used as a linear movement driven member of the elevator box 2.
It is rotatably supported by an upper thrust bearing 26 and a lower rotating shaft 27 attached to 4' and is supported so as not to move relative to each other in the axial load direction. Male thread member 12
A hollow transmission shaft 31 is rotatably supported on the same axis by bearings 29 and 30 in the elevator box 24' via a flexible coupling 28 attached to the lower part.
connected to. A chain 35 is connected from the sprocket 33 of the motor 32, which is attached to the necessary reducer, brake, and other equipment attached to the lower part of the elevator box 24', to the sprocket 34 of the transmission shaft.
The externally threaded member 12 is rotated.
A lower support wheel 37 is provided at the lower part of the elevator box 24' by a bracket 36, and together with the engagement of the upper screw members 1 and 12, it counteracts the load moment. In addition to the upper double screw screw member, a similar double screw screw member is installed at the bottom,
The engagement in them can counteract the load moment. By providing two sets of the above-mentioned double screw members and drive mechanisms and arranging them in parallel, the elevator box 24 is prevented from rotating itself, that is, from lateral vibration. It is preferable that the screw directions of both parallel threaded members be opposite to each other. If the elevator box 24' is suitably provided with other guide means, such as vertical guide rails and guide rolls, the load moment of the elevator box is supported by these, and the axis of the male threaded member 12 is aligned with the female threaded member 1. If the screwing relationship can be maintained, as described above, the need to measure the axis alignment depending on the engagement between the engagement wall 5 and the flange 23 is reduced, These can be of light construction.

In the present invention, by screwing and rotating a male threaded member into a fixed female threaded member, the male threaded member moves in the axial direction, and a linearly movable driven member related to the male threaded member in a fixed relationship can be linearly moved. In this case, assuming that the frictional resistance at the threaded part is μ, the load pressure is P, and the circumferential speed is V, the μPV value that gives the heat generation limit when a large load is applied is determined by the resistance of the threaded parts to the rolling friction of the roller. Because the rollers move relative to each other, the frictional resistance μ is small, and the load pressure P can be reduced to an appropriate value by increasing the number of rollers. In other words, the rotational speed of the male threaded member is increased, and the linear motion driven member can be operated at high speed. This also reduces the need for deceleration in the drive and allows for highly efficient operation with less frictional power loss. In addition, as a lifting device, the threaded part relies on rolling friction resistance, so if the drive system of the male threaded member is stopped and the brake is released, the male threaded member will rotate due to the load applied to the male threaded member, and the descent during return operation will be prevented. It is done by oneself.

According to the present invention, as a linear motion device using a screw, the length of the linear motion can be lengthened with virtually no limit, and it can be manufactured relatively easily with the desired accuracy, resulting in low cost, and the direction of motion is vertical. You can also choose diagonal or horizontal direction.
Since the load capacity can be increased, the present invention has the advantage that it can be advantageously applied to various applications in addition to the elevator described above.

[Brief explanation of the drawing]

1 is a cross-sectional view of a female threaded member in an embodiment of the present invention in FIG. 2, a cross-sectional view of the female thread member in FIG.
The drawings are a vertical sectional side view of a male threaded member according to an embodiment of the present invention, FIG. 4 is a side external view thereof, FIG. 5 is a side view of an embodiment of the present invention in which the linear motion driven member is an elevator, and FIG. 6 FIG. 2 is a partially vertical side view of the roller in a locked state. X...screw axis, D...diameter, p...pitch,
T...Helix line, P...Load direction, Z...Roller axis, d1...Roller diameter, d2...Flame diameter, w...
Flange width, W...Groove width, 1...Femally threaded member, 2...
Concave surface, 3... Partial spiral groove, 4... Lower edge, 5, 5'
...Engagement wall, 6...Wing portion, 7...Entry port, 8...
...Exit port, 9...Girder part, 10...Mounting seat part, 11
... Mounting hole, 12 ... Male thread member, 13 ... Rotating shaft, 14 ... Key, 15 ... Cylindrical body, 16 ... Roller, 17 ... Roller base, 18, 19 ... Ball bearing, 20 ... Reception socket, 21...Snat spring, 2
2... Receiving groove, 23, 23'... Flange, 24... Linear motion driven member, 24'... Elevator box, 25... Fixed support wall, 26... Thrust bearing, 2
7, 29, 30... Rotating bearing, 28... Flexible coupling, 31... Hollow transmission shaft, 32... Motor, 33, 34... Sprout, 35... Chain, 36... Bracket, 37... Lower support wheels.

Claims (1)

[Claims] 1. Based on a screw thread T of a constant diameter D and a constant pitch P centered on the screw axis X, the female screw member 1 is relatively long in the axial direction and is open on the side of the semicircumference or more of the cross section. It is formed by arranging partial helical grooves 3 having groove edges 4 along the reference helix in the axial direction in the range of the concave surface 2 having an arcuate cross section of less than the remaining half circumference, and is fixed to the fixing part 25. On the other hand, the male threaded member 12 has a plurality of rollers 16 rotatably supported around the radial axis Z on the circumferential surface of a relatively short cylindrical base 15 in the axial direction, arranged so as to be in contact with the reference thread. The partial helical groove of the internally threaded member is connected to the linear movement driven member 24 which is arranged in rows over the entire circumference and whose rotation is restrained and is immovable relative to the axial load direction, rotatable and can transmit rotation. has an engaging wall surface behind it, and the roller of the male threaded member has a protruding annular flange for engaging.A linear motion device using a roller screw mechanism. 2. The linear motion device according to claim 1, wherein an entrance port 9 and an exit port 8 of the spiral portion of the male threaded member are provided at each end of the partial spiral groove.