JPS58622A - Direct-acting guide - Google Patents

Abstract

PURPOSE:To make shafts and a housing compact and heighten their accuracy of machining, by fitting a round shaft having roller circulation guide grooves elliptically extending on the peripheral surface of the shaft in the axial direction and intersecting each other, in a housing so that the round shaft is contact with a guide shaft. CONSTITUTION:A round shaft 3, which has roller circulation guide grooves elliptically extending on the peripheral part of the shaft in the axial direction and intersecting each other and whose peipheral part is cut in the axial direction, and members 4, which correspond to the roller grooves at the ends of the shaft 3 to define circulation passages for rrollers 2, arc secured in a housing 1 by side plates 5 for axial positioning. Two lines of the rollers 2 are placed in contact with both the sides of axial trapezoidal grooves of the sides of a guide shaft 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a linear motion guide for a reciprocating movable table in the construction of various types of machinery such as machine tools and industrial machinery.

A large number of rollers that roll in the axial direction K1111 are interposed between a pedestal that supports a movable platform and a shaft that guides the pedestal, thereby improving the performance of various types of machinery.

The aim is to contribute to streamlining the structure, and compared to this type of linear motion guide that uses balls as rolling elements in conventional products, this linear motion guide has superior load capacity, rigidity, and durability. This is what we are trying to achieve. However, in this type of linear motion guide that uses rollers instead of the balls mentioned above, it is necessary to rationally form a path for the rollers to support the load within the mount, roll in the axial direction, and then circulate repeatedly. This is difficult, and this type of linear motion guide using only rollers has not yet been seen.

The feature of the linear motion guide of the present invention is that the paths of four sets of rollers 1j, each of which supports and circulates the load in the vertical and horizontal directions of the shaft, are formed in the frame in an extremely rational manner, thereby making the shaft and the frame more compact. In addition to improving the linear motion accuracy of scales, it also has excellent load bearing capacity of 2%.
This makes it easy to rationally set the preload required to ensure guiding accuracy under fluctuating loads, which not only makes the row structure more rational, but also allows the simple shape of the component parts of the linear motion guide to achieve high precision. , it is a good idea to pay attention to the application of high-efficiency machining methods.

The structure of the linear motion guide of the present invention is shown in the axial front view and side view of the attached FIGS.
The roller has axially oval-shaped guide grooves for circulating the rollers that intersect with each other on the periphery.

It is a round shaft with the peripheral part opened in the i-axis direction as shown in the figure, and 4 is the shaft end of the shaft 3, which is adapted to the rolling groove of the roller.

Components for forming a circulating transfer path for rollers; 5 is a side plate for axial positioning of the components 3 and 4 for forming a circulating transfer path for rollers into the frame body l; 6 is a side plate for forming roller transfer surfaces on both sides; 7 is a dust seal interposed between the pedestal and the guide shaft 6, 8 is a screw hole for attaching the pedestal to the moving table, and 9 is a side plate 5. 10 is a bolt hole for fixing the guide shaft 6 to the mounting base. As shown in the figure, the linear motion guide of the present invention includes a gantry main body 1 for configuring a gantry.

A large number of rollers are fed into the circulation path formed by the parts 3 and 4 mounted inside the frame body.

Among these component parts, the mount main body IK has an open end at the bottom of a simple rectangular parallelepiped block as shown in the figure, and has a guide shaft 6 that is applied to the mount. The inner circumferential surface in the axial direction is molded to maintain a slight gap between the guide shafts, and the inner circumferential surface in the axial direction is molded to correspond to both sides of the guide shaft. KFg on both sides of the shaft based on a simple rectangular cross section
! A trapezoidal axial groove shown in J was formed.

Consists of simple shapes.

Therefore, a high degree of finishing accuracy can be expected from the component parts formed by these planes and cylindrical surfaces by ordinary cutting and grinding methods when molding them.

Attached Figures 3 ■ to [F] are shown in attached Figure 1 and fa2. A shaft 3 and parts 4 fixed to both axial end surfaces of the shaft
A front view and both side views of a partially assembled drawing.

and a bottom view and a partially enlarged view. As shown in the figure, the shaft 3 has two sets of rolling grooves for circulation of the rollers, the groove bottoms of which have an elliptical shape in the axial direction, and two sets of grooves that intersect three-dimensionally at both ends in the axial direction. The groove bottom of the above-mentioned oval shape is formed with different lengths in the axial direction.

As shown in FIG. 2, side plates 4 are formed on both ends of the shaft in the axial direction, and convex portions that intersect with each other corresponding to the two sets of circulating rolling grooves are formed on one end surface in the axial direction that fits the shaft. The convex portion is fitted into the rolling groove of the roller without a gap, and the axial end face of the convex portion is provided with a circulation path where the rollers intersect, corresponding to the axially oval groove bottom shape of the shaft 3. Two circular arc-shaped concave surfaces were formed by providing steps in the axial direction according to each circulation path, and were formed by the shaft 3 and its side plate 4. As shown in Figure 1, rollers 2 are provided in the circulation path of two sets of rollers that intersect with each other.

Reference numeral 11 in the figure is a fixing screw for fixing the side plate 4 to the shaft 3.

Reference numeral 12 denotes a metal plate for preventing the rollers rolling in the load range from falling out of the transfer groove. , are arranged with a slight gap and fixed to the shaft 3 by the screw 131C.

Attached Figures 4 (4) to C) are a front view and a side view of the round shaft 3 in the axial direction after forming the rolling grooves of the rollers, and 14 in Figure 9 is the rolling groove of the rollers as shown in Figure 9. Each rolling groove bottom has its own circulation! The shaft 3 has an oval shape in the axial direction with different lengths in the axial direction corresponding to the path, and the shape of the outer circumferential surface of the shaft 3 is formed on both sides of the inner circumferential surface in the axial direction of the gantry main body L. A near-zero gap is set on the axial cylindrical surface that has an open end facing the side surface of the shaft 6, and the cylindrical surface in the mount is made into an axial circular ftJ surface so that they fit together. The opening corresponds to the shape of the trapezoidal axial trapezoidal groove formed on both sides of the guide shaft 60, and is formed into an axial trapezoidal surface with a slight gap between the guide shaft 60 and the trapezoidal groove.

In this outer rotation, 15 is a hole for fixing the side plate 4 to the shaft 3, and 16 is a hole in which the rolling groove bottoms of two sets of axially oval rollers are formed at intersecting positions at both ends in the axial direction. This is the opening of the notch for the rolling groove.

Attached FIGS. 5(4) to 5(a) are a front view and both side views of the side plate 4 fixed to both end surfaces of the shaft 3 in the axial direction.

As shown above, on one side of the side plate 4, two sets of grooves are provided near both ends of the shaft 3 in the axial direction, corresponding to the shape of the groove bottom of the roller, which is in the shape of an arc. Two convex portions 17 and 18 in the axial direction that intersect with each other are formed to form the microvolume path of the roller, and the width of each convex portion corresponds to the rolling groove width of the roller, and there is a gap between the convex portions 17 and 18. The end surfaces of the convex portions 17 and 1B that fit together with the shaft 3 are made of an arcuate cylindrical surface as shown in the figure, corresponding to the groove bottom shape of the shaft 3, and the end surfaces of the cylindrical surface shape are formed. The rounding 2 forming the circulation path of the rollers intersecting each other three-dimensionally is formed by maintaining a step in the axial direction of the shaft 3 as shown in the figure, and the size of the arc-shaped end surface formed in the convex part 17 at this time is The portion is formed in the shape of an arcuate groove in the side plate, and the groove bottom of the groove is connected to a square hole 20 formed in the side surface 19 of the side plate 4.

In addition, the square holes 20 are formed at both axial end portions of the shaft 3 with different axial lengths, and are used in forming a rolling roller of two axially oval rollers that intersect three-dimensionally. At the position where the two grooves intersect, due to the shaping of the circulation grooves that intersect on the inside at the position shown at 16 in attached Figure 4, it becomes impossible to isolate both the outside and inside circulation channels, and as a result, In the molding of the partition wall 21 in the necessary axial convex portion 18, this was formed due to the configuration of the mold used to mold this by injection molding. Also, 22 in the figure is a part that fixes the side plate 4 to the shaft 3. This is a bolt hole for

Next, regarding the forming process of the shaft 3 and the plate 4 of the shaft 3 that constitute the above-mentioned mutually intersecting roller rotation path, the roller transfer in the axial direction of the shaft 8 is performed by cold drawing from a round shaft. Or, by milling after forming such as cold extrusion in press processing, the arcuate groove bottoms at both axial ends and the surrounding trapezoidal surfaces in the axial direction are formed, and then the hardening heat treatment is completed. High-precision molding is expected using conventional processing methods such as precision processing of the groove bottom and both sides of the groove. In addition, while it is difficult to form the side plate 4 with high properties by cutting, it can be easily formed by injection molding of synthetic resin or low-melting metal, and the mold used for this process is High-precision INK molding can be performed using normal processing methods.

Attached Figure 6 (4), a3) is an explanatory diagram of the load capacity of the linear motion guide of the present invention. It is supported by the contact pressure between the roller row and the slope of the axial trapezoidal groove formed on the guide shaft. In addition, when a variable load is applied to the frame, the preload setting is done by selecting the diameter of the rollers that circulate and roll within the frame. When the load support range is larger than 1, the contact pressure caused by the elastic deformation of the mount body, rollers, guide shaft, etc. that are related to this is applied between the roller row i in the load supporting range and the transfer surface of the guide shaft. A load is applied and dynamic rigidity can be improved. At this time, contact between the rollers in the load-supporting range, the guide shaft, and the transfer surface inside the pedestal is ensured. The shaft 3 inserted into the frame body 1 maintains complete contact between the rollers 2 in the load-bearing range and the transfer surface of the guide shaft 60.
It adapts to the deformation of the roller and rotates at a low angle to maintain its normal state, and uneven contact between the roller and the transfer surface is unlikely to occur.

Attached Figures 7 to 7 are explanatory diagrams regarding the loads acting in the vertical and horizontal directions of the pedestal and the corresponding load capacity of the linear motion guide in the linear motion guide of the present invention.
3), the two sections were formed so as to intersect with each other as shown in the attached Figure 3. The total number of rollers supplied to the two circulation paths with different axial lengths is different, and the load support distance H
The number of rollers is also different, thus, for example, in the rows of rollers in the two load-bearing areas arranged on the slopes of the axial trapezoidal grooves on both sides of the guide shaft shown in the upper part of the figure.

KoroKf! If the number of rollers in the path with + lines is greater than the number of rollers on the side where the rollers are not shaded, please refer to 5 as shown in the bottom corner diagram in Figure 1.

The load capacity as a linear motion guide is symmetrically the same in the left-right direction, but in the vertical direction, the load capacity is larger for loads acting downward than for loads acting upward. figure(
B) In the nine embodiments shown in K.

Unlike the case in FIG. 4, the load capacity for loads acting upward is larger than the load capacity for loads acting downward. In Figure C), the components of the a-term path of the rollers are the same as those in Figure (4) and ω), and are molded on both sides of the guide shaft. The inclination angles of the slopes in the axial direction, which are the transfer surfaces of the rollers, are made to differ, and the circulation path of the rollers in the frame is made to correspond to this.In this embodiment, as shown in the vector diagram in the figure, The downward load capacity can be increased relative to the upward load capacity. In general, in the application of this type of linear motion guide to various types of machinery.

In addition to the moving table that reciprocates under a load applied from above in a horizontal plane, the front and back of the moving table that reciprocates in the vertical direction,
As in the case where a linear motion guide is placed and restrained in one direction (left and right) on plane A, the magnitude of the load on the upper and lower sides of the gantry shown in Figure 9 will differ due to the difference in the vertical position of the gantry fixed to the moving platform. , corresponding to the load acting on the linear motion guide, the possibility of selecting the load capacity is heavy! become. In the linear motion guide of the present invention, as shown in the figure, the shape of the pedestal and the guide shaft.

Without having to make any changes to dimensions etc.

The number of rollers for load support Ii8 in the frame is 14KLl Alternation of the arrangement of the guide shafts of the two roller rows with respect to the transfer plane Q
Alternatively, nine linear motion guide tubes can be realized with different load capacities in the upper and lower directions.

As described above, in the present invention, a rolling element that circulates and supports the load is interposed between the guide shaft and the movable table and the nine mounts, and in the nine linear motion guide, the load bearing capacity, durability, etc. are improved compared to one ball. Adopting excellent rollers for the rolling elements, the structure is simple and highly accurate.
In addition to its load-bearing capacity and durability, it is also excellent in static image performance against static loads, and the preload that is essential for improving dynamic rigidity can be easily and rationally set. At the same time, it is possible to arrange the load capacity in accordance with the direction and magnitude of the load acting on the frame. In addition, the guide shaft, mount body, and components involved in the formation of the circulation transfer path in the linear motion guide of the present invention can all be processed by normal cutting, grinding, pressing, and injection molding of synthetic resin. It is possible to easily realize high precision, high performance linear motion guide.

[Brief explanation of the drawing]

Attached Figures 1 and 2 are a front view and a side view of the linear motion guide of the present invention, Figure 3 is a partially assembled view of the components of the roller circulation path, and Figure 4 is a partially assembled view of the roller circulation path component.
Fig. 5 is an explanatory diagram of a shaft with rolling grooves formed thereon for configuring a circulation path for rollers, Fig. 5 is an explanatory view of a side plate for configuring a circulation path for rollers, and Figs. It is an explanatory diagram regarding load capacity. Also, corresponding to the symbols in the above figure, 1, frame body 2, rollers 3, shaft 4 with roller rolling grooves formed, side plate of shaft 3, side plate 6 of frame body 1, guide shaft 7, dust seal 8, frame Fixing screw holes 9, side plate 5 fixing screws 10, guide shaft 6 fixing bolt holes 11, plate 4 fixing screws 12, sheet metal 13 for preventing rollers from falling off, sheet metal 12 fixing screws 14, molded on the shaft 3 Roller rolling groove 11 Side plate 4
Fixing screw hole 16, notches 17, 18' at the bottom of the rolling groove of the roller, axial protrusion 19 on the side plate 4 @ axial piece lI of the plate 4! End face 20, square hole 21 formed on end face 19, transfer lllIC wall 22 formed on axial convex part 8, screw hole for fixing @ plate 4 Patent applicant Su Tasen (left row 11F - 對昭ふ [
1st night 2nd year // 112r Hii Koi fT-'r Cho' Hakushima 1 (1st spring
Camellia 1 Tono 14 <C Cow's soaking・) tu s er, <r; Patent tuna 'E09
4552 eyes 2 Name of the invention 1r i moving room 3 @ city playing person insect i cow and tn'■ f series Sekiyoshi 4 n city 1- a Date of match Showa s 61+-】o +1271
15 Correction of 74ψ lvii 11 (412-5in 1) 6 Correction of zero Don 11 (Gino・
9052 Kuni (1-A'c'J)

Claims (1)

[Claims] 113 In a nine-direction guide in which a large number of rollers that support a load by repeating cyclic transfer are interposed between a guide shaft and a frame that supports the reciprocating table, Forming in the axial direction a trapezoidal groove having a rectangular cross-section perpendicular to the axial direction, and sloping trapezoidal grooves consisting of 92 planes and parallel planes on both sides of each shaft;
#A guide shaft 6 formed by forming the two slopes of each trapezoidal groove on both sides as roller transfer surfaces that support loads as axes;
Axis 6! A frame that is compatible with IC and reciprocates. The outer circumferential surface has a rectangular parallelepiped shape, and an axial recess opening at the bottom to accommodate the shaft 6, and openings corresponding to the axial trapezoidal grooves formed on both sides KFi of the recess and the axial trapezoidal grooves formed on both sides of the shaft 6. An axial hole was formed with an end. Saddle-shaped mount body 1
The rollers are fitted into axial holes having open ends on both sides of the axial recess of the mount body l, and the rollers are aligned in correspondence with the roller transfer surfaces of the guide shaft 1. Shaft 3 with molded dynamic grooves
and the side plate 4 of the #shaft 3, and after supplying a large number of rollers to the skeleton circulation path, a roller for axial positioning of the circulation path component with respect to the mount body l. The side plate 5 and the side plate 4 are formed in the mount, and are formed in the axial direction around the shaft 3 and at both ends in the axial direction to form a circulating transfer path for the rollers. The rolling groove of the roller. For each of the slopes in the trapezoidal groove on the side surface of the guide shaft 6, the rolling grooves of the rollers in the load supporting range in the axial direction at the peripheral position on one side of the shaft 3 located perpendicularly from the shaft center are The directional rolling groove and the axial rolling groove for circulation in the axial direction at the peripheral position facing each other are formed parallel to each other, and the bottom surfaces of these parallel grooves are arcuate at both ends in the axial direction. Corresponding to the shape of these groove bottoms, the side shapes of the grooves at both ends in the axial direction are fixed.Furthermore, the rolling groove of a roller whose groove bottom has an elliptical shape in the axial direction is Corresponding to the two slopes of the above-mentioned axial trapezoidal groove on the side surface of the guide shaft, the grooves are formed independently around the shaft located in the direction perpendicular to each slope, and are formed at both axial ends of the shaft 3. Both grooves intersect with each other on the surface, and a step slightly larger than the diameter of the roller is provided between them at both axial ends of the axially oval circulation path of the roller formed by these guide grooves. In order to allow the rollers in each circulation path to roll without contacting each other, in the shaft 3, in forming the groove bottom of the above-mentioned axially oval shape, the rollers intersect at both ends in the axial direction. A step larger than the diameter of the roller is provided between the bottoms of both grooves, and the side plate 4 of the shaft 30 is formed with a step larger than the diameter of the roller.
The one end surface in the axial direction that contacts the shaft 30 is fitted with guide grooves of rollers formed so as to intersect with each other on both end surfaces of the shaft 30. The end surfaces of the axial convex portions formed to intersect with each other are formed at both axial ends in correspondence with the arc-shaped convex surfaces formed at both axial ends of the groove bottom of each circulation groove of the shaft 3. It is formed into an arcuate concave surface to form a circulation path for the rollers, and at both ports in the axial direction of the shaft 3, one guide groove is formed at the intersection of the two guide grooves in forming each groove. A linear motion guide characterized in that a partition wall 21 is formed to separate both guide grooves when they are opened to the bottom of the other guide groove. (2) A linear motion guide according to claim (1). In , the outer circumferential surface of the shaft 3 on which the roller transfer guide groove was formed 7,
The area to be fitted into the mounting hole of the pedestal main body l is formed into a cylindrical shape, and the rollers in the load supporting area within the pedestal are aligned with the guide shaft 6.
A linear motion guide whose special purpose is to adapt to the rolling surface of the rollers and allow rolling while avoiding uneven contact in the axial direction. (3) In the linear motion guide described in claim (1),
An inclined relief surface is formed on the circumferential surface of the axial end of the roller that rotates in circulation, and the roller is fed into the transfer guide groove of the round shaft 3.
In the range where the rollers maintain simultaneous contact with the transfer surface of the guide shaft 60 and support the load, both end surfaces of the sheet metal 12 in the axial direction are applied to the inclined relief surfaces of the rollers, and when the mount is removed from the guide shaft 6. A linear motion guide characterized by preventing rollers from falling off the shaft 3.