JP2006038094A - Sliding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an novel sliding device having extreme practicability capable of achieving smooth sliding of a sliding element, and improving durability and productivity by eliminating a retainer for rolling elements to simplify the structure. <P>SOLUTION: The sliding element 2 is provided to be slidable to a shaft 1, and a plurality of rolling elements 3 are disposed between the shaft 1 and the sliding element 2, so that the rolling elements 3 roll between the shaft 1 and the sliding element 2 in this sliding device. On an inner circumferential surface of the sliding element 2, a load part 4 composed of the inner circumferential surface and an outer circumferential surface of the shaft 1 for the rolling elements 3 to be disposed is provided. A no-load part 6 is provided outward of the load part 4 where the rolling elements 3 are disposed. The no-load part 6 and the load part 4 are connected to each other through a return part 7 where the rolling elements 3 return. The rolling elements 3 get into a load bearing state at the position of the load part 4, and get into a a no-load state at the position of the no-load part 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sliding device.

  As a conventional sliding device, for example, as shown in FIG. 1, a sliding body 22 is provided to slide with respect to a shaft 21, and a load portion 23 is provided between the shaft 21 and the sliding body 22. A plurality of rolling elements 24 are provided in the load section 23, and the rolling elements 24 are configured to roll along the load section 23. Between the shaft 21 and the sliding body 22, A rolling element holder 25 for holding the rolling element 24 is provided, and the rolling element holder 25 is formed with a no-load portion in which the rolling element 24 that rolls and moves through the load portion 23 circulates. In some cases, a return portion is formed between the load portion 23, the no-load portion, and the load portion 23, the no-load portion, and the return portion form a rolling element infinite circuit. In the figure, reference numeral 26 denotes a groove for fixing the housing, 27 denotes a receiver for receiving the rolling element holder 25, and 28 denotes a retaining ring.

  Further, as disclosed in Japanese Patent Application Laid-Open No. Sho 62-127511 (Patent Document 1) and Japanese Patent Application Laid-Open No. Sho 52-60354 (Patent Document 2), a plurality of rolling element holders are used for linear sliding or There is also a configuration that can perform rotational sliding or both at the same time.

Japanese Patent Laid-Open No. Sho 62-127511 Japanese Patent Laid-Open No. 52-60354

  However, as described above, the conventional sliding device has an increased number of parts due to the presence of the rolling element holder that holds the rolling elements, which leads to a complicated structure and manufacturing process, and is liable to cause a failure. There was a problem of being inferior.

  In particular, such a problem becomes more prominent because the structure becomes more complicated in the sliding device configured to perform the linear sliding and / or the rotational sliding at the same time.

  In view of the present situation as described above, the present invention has been completed by finding a configuration that enables smooth sliding even without a rolling element retainer as a result of various studies, and omits the rolling element retainer. It is an object of the present invention to provide an innovative sliding device that can realize a simple structure and is extremely practical.

  The gist of the present invention will be described with reference to the accompanying drawings.

  A sliding body 2 is provided so as to slide relative to the shaft 1, and a plurality of rolling elements 3 are disposed between the shaft 1 and the sliding body 2, and the rolling bodies 3 are connected to the shaft 1 and the shaft 1. The sliding device is configured to roll between the sliding body 2, and the inner circumferential surface of the sliding body 2 includes the inner circumferential surface and the outer circumferential surface of the shaft 1. Is provided. A load-free part 6 is provided outside the load part 4 and a rolling element 3 is provided. The load-free part 6 and the load part 4 are The moving body 3 is communicated via a return portion 7 that returns, and the rolling body 3 is configured to receive a load at the position of the load portion 4 and to be in a no-load state at the position of the no-load portion 6. The present invention relates to a characteristic sliding device.

  The sliding device according to claim 1, wherein the return portion 7 is provided in front of and behind the sliding body 2.

  Further, in the sliding device according to any one of claims 1 and 2, the rolling elements 3 in the load portion 4 are configured to be linearly aligned in the length direction of the shaft 1. This relates to a sliding device.

  The sliding device according to any one of claims 1 to 3, wherein the sliding body 2 includes a base body 2a, a front cover body 2b provided from the front of the base body 2a, and a rear cover body 2c provided from the rear. By providing the front cover body 2b and the rear cover body 2c on the base body 2a, the no-load part 6 and the return part 7 are formed between the base body 2a and the front cover body 2b and the rear cover body 2c. The present invention relates to a sliding device that is configured.

  Further, in the sliding device according to claim 4, the return portion 7 includes a front return portion 7 formed by the front end portion of the base body 2a and the front cover body 2b, and a rear end portion of the base body 2a and the rear cover body 2c. The present invention relates to a sliding device characterized in that a return portion 7 is formed.

  Further, in the sliding device according to any one of claims 4 and 5, the base body 2a is configured such that the shaft 1 is inserted, and the front cover body 2b and the rear cover body 2c are fitted to the base body 2a. The positioning protrusion 9 extending in the length direction of the base 2a is provided on the outer peripheral surface of the base 2a, and the positioning protrusion 9 is provided on the front cover 2b and the rear cover 2c. The present invention relates to a sliding device characterized in that a concave groove 10 is provided to be engaged.

  Further, in the sliding device according to claim 6, the positioning protrusion 9 is set in a shape such that the effective area of the load portion 4 and the effective area of the no-load portion 6 are substantially the same area. This relates to the sliding device.

  Further, in the sliding device according to any one of claims 4 to 7, a rolling element that moves from the load part 4 to the no-load part 6 and from the no-load part 6 to the load part 4 is located forward and backward of the base body 2a. 3 is provided with a guide portion 8 capable of guiding the movement of 3.

  The sliding device according to claim 8, wherein the guide portion 8 projects from an end portion of the positioning protrusion 9 in the extending direction.

  Further, in the sliding device according to any one of claims 1 to 9, the load section 4, the return section 7 and the no-load section 6 are arranged such that a plurality of rolling element rows formed by a large number of rolling elements 3 are arranged. The present invention relates to a sliding device that is configured as follows.

  Further, in the sliding device according to any one of claims 1 to 10, any rolling element 3 in the load portion 4 moves to the no-load portion 6 via the return portion 7, and further, the no-load portion The sliding device is configured to move from 6 to the load unit 4 via the return unit 7.

  The sliding device according to any one of claims 1 to 11, wherein the rolling element 3 disposed in the load portion 4 is configured to roll on the outer periphery of the shaft 1. This relates to the sliding device.

  The sliding device according to any one of claims 1 to 12, wherein the shaft 1 has a circular cross-sectional view, and the sliding body 2 has a cylindrical shape fitted on the shaft 1. The sliding body 2 relates to a sliding device characterized by being configured to perform linear sliding or rotational sliding or both at the same time.

  Since the present invention is configured as described above, it is possible not only to achieve smooth sliding of the sliding body, but also to simplify the structure by omitting the rolling element retainer and improve durability and productivity. This is a revolutionary sliding device that is extremely practical.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

  When the sliding body 2 is slid with respect to the shaft 1, the rolling element 3 receives the load at the load part 4 and rolls, and returns by the return part 7 and moves to the no-load part 6. Return from the part 6 by the return part 7 and move to the load part 4.

  Accordingly, the rolling element 3 of the load part 4 and the rolling element 3 of the unloaded part 6 can circulate and achieve good sliding, without the rolling element retainer. Since there is no vessel, the structure is simplified, and durability and productivity can be improved.

  Specific embodiments of the present invention will be described with reference to the drawings.

  In this embodiment, a sliding body 2 is provided so as to slide relative to the shaft 1, and a plurality of rolling elements 3 are disposed between the shaft 1 and the sliding body 2. A sliding device configured to roll between the shaft 1 and the sliding body 2, wherein the inner circumferential surface of the sliding body 2 includes an inner circumferential surface and an outer circumferential surface of the shaft 1. A load portion 4 is provided, on which the rolling element 3 is arranged, and an unloading portion 6 on which the rolling element 3 is arranged is provided outside the load portion 4, and the no-load portion 6 and the load are provided. The rolling element 3 communicates with the part 4 via a return part 7 from which the rolling element 3 returns, and the rolling element 3 is in a state of receiving a load at the position of the load part 4 and is in a no-load state at the position of the no-load part 6. It is what has been.

  Each part will be specifically described.

  The shaft 1 has a circular shape in sectional view. As the sliding body 2, a cylindrical one fitted on the shaft 1 is employed.

  The rolling element 3 (ball) disposed between the sliding body 2 and the shaft 1 can be moved in the extending direction and the circumferential direction of the shaft 1, and the sliding body 2 can be linearly slid or rotated. It is the structure which can perform sliding or both simultaneously.

  As shown in FIG. 2, the sliding body 2 includes an annular base body 2a, a front cover body 2b that is fitted from the front side of the base body 2a, and a peripheral plate and an end plate. It is comprised by the back cover body 2c which consists of a board. The front cover body 2b and the rear cover body 2c have a peripheral wall projecting inwardly on the inner surface of the end plate, and the inside of the peripheral wall is set to a hole 15 through which the shaft 1 is inserted. Accordingly, the inner surface of the peripheral wall of the front cover body 2 b and the inner surface of the peripheral wall of the rear cover body 2 c are in contact with the shaft 1.

  In addition, as the base 2a, other shapes such as an annular shape or a C shape with a part cut away may be adopted instead of the annular shape.

  Further, the peripheral wall projecting from the inner surface of the end plate, the inner surface of the end plate, and the peripheral plate are formed as a curved surface continuously provided as a return portion 7.

  By fitting the front cover body 2b and the rear cover body 2c to the base body 2a, a no-load portion 6 is formed between the outer periphery of the base body 2a and the inner periphery of the peripheral plate of the front cover body 2b and the rear cover body 2c, The front return portion 7 is formed by the front end portion of the base body 2a and the inner surface of the peripheral plate of the front cover body 2b, the inner surface of the end plate, and the inner surface of the peripheral wall. The rear return portion 7 is formed by the inner surface of the end plate and the inner surface of the peripheral wall.

  A plurality of positioning ridges 9 extending in the length direction of the base body 2a are provided on the outer peripheral surface of the base body 2a of the sliding body 2, and the positioning ridge lines 9 are provided on the front cover body 2b and the rear cover body 2c. A recessed groove 10 is provided to engage with the.

  Specifically, six positioning ridges 9 are provided at equal intervals on the outer peripheral surface of the base 2a, and the concave grooves 10 that engage with the positioning ridges 9 are also provided in the front cover body 2b and the rear cover body 2c, respectively. One is provided.

  Further, one positioning protrusion 9 and the two concave grooves 10 of the front cover body 2b and the rear cover body 2c are set to substantially coincide with each other, and the base body 2a, the front cover body 2b, the rear cover body 2c, This play is prevented as much as possible.

  Further, the distance between the inner peripheral surface of the base body 2 a and the outer peripheral surface of the shaft 1 is set to a distance substantially equal to the diameter of the rolling element 3, and this portion becomes the load portion 4. Further, the interval between the outer peripheral surface of the base body 2a and the inner peripheral surfaces of the front cover body 2b and the rear cover body 2c is set to be slightly larger than the diameter of the rolling element 3, and this portion becomes the no-load portion 6. .

  Accordingly, the rolling elements 3 are arranged in parallel on the base 2a, and a large number of rolling elements 3 are provided between the inner peripheral surface of the base 2a and the outer peripheral surface of the shaft 1 and between the outer peripheral surface of the base 2a and the front cover body 2b and the rear cover body 2c. When the rolling elements 3 are filled, a plurality of rolling element rows formed by the large number of rolling elements 3 are arranged in the load part 4, the return part 7 and the no-load part 6. That is, even if there is no rolling element holder, the rolling elements 3 are aligned, and a satisfactory sliding movement can be achieved.

  Specifically, the rolling elements 3 may be arranged in appropriate numbers in the load part 4 and the no-load part 6, and preferably in a zigzag shape as shown in FIG. 5 or as shown in FIG. It is arranged in a straight line in the length direction of the axis 1 such as a lattice shape. In this embodiment, the contact between the rolling elements is set in a zigzag shape that can achieve more stable and smooth sliding.

  Further, the positioning protrusion 9 has an effective area of the load portion 4 (an area where the rolling elements 3 can be disposed) and an effective area of the unloaded portion 6 (an area between the positioning protrusions 9) substantially the same area. The shape is set.

  Therefore, the number of rolling element rows described above is the same in the load part 4 and the no-load part 6, and the circulation of the rolling elements 3 is smoothed accordingly, and good sliding can be achieved.

  In this embodiment, the positioning ridges 9 are provided only on the outer peripheral surface of the base 2a, but may be provided only on the inner peripheral surface of the base 2a or may be provided on the inner and outer peripheral surfaces. However, the type of this embodiment is most preferable because the entire inner peripheral surface is used as the load portion 4 and the effective areas of the inner peripheral surface and the outer peripheral surface can be made substantially equal.

  In addition, a guide portion 8 that can guide the movement of the rolling element 3 moving from the load portion 4 to the no-load portion 6 and from the no-load portion 6 to the load portion 4 is provided in front and rear of the base body 2a. The guide 8 protrudes from the end of the positioning protrusion 9 in the extending direction.

  The guide portion 8 of the present embodiment is a fixing screw 11 for fixing the front cover body 2b and the rear cover body 2c to the base body 2a.

  Specifically, female screw portions 12 that are engaged with the male screw portions of the fixing screw 11 are formed at positions below both end surfaces of the positioning protrusion 9 in the extending direction, and the front cover body 2b and the rear portion are formed. An insertion hole 13 through which the fixing screw 11 is inserted is formed on the outer surface of the end plate of the cover body 2c, and the fixing screw 11 is inserted through the insertion hole 13 and screwed into the female screw portion 12 so as to move forward. The cover body 2b and the rear cover body 2c are fixed.

  As described above, the positioning ridges 9 are provided on the outer peripheral surface of the base 2a so that the effective areas of the unloaded portion 6 and the loaded portion 4 are the same. Therefore, the movement of the rolling element 3 from the load portion 4 to the no-load portion 6 (the no-load portion 6 to the load portion 4) is inhibited by the end face of the positioning ridge 9 at the position of the positioning ridge 9. In this respect, the fixing screw 11 is positioned at a position below the both end surfaces in the extending direction of the positioning protrusion 9 so that the fixing screw 11 closes the end surface (prevents movement of the rolling element 3 to the end surface) and rolls. The rolling body 3 that guides the moving body 3 satisfactorily and moves the end portions of the base 2a (that is, the front return portion 7 and the rear return portion 7) is not hindered by the end surfaces of the positioning ridges 9, so that The rolling element row is not broken and is introduced into the load part 4 or the no-load part 6 (see FIG. 4).

  Therefore, the fixing screw 11 has an effect of securely fixing the front cover body 2b and the rear cover body 2c to the base body 2a, and an effect of achieving good sliding by guiding the movement of the rolling element 3. For example, compared with the case where the end surface corner portion of the positioning ridge 9 is formed in an R shape, the cost and productivity are excellent.

  In the present embodiment, a fixing screw 11 protruding from the extending direction end of the positioning projection 9 is employed as the guide portion 8, but as shown in FIG. An inclined surface forming body 14 having a curved inclined surface that can move the rolling element 3 while avoiding the fixing screw 11 may be provided on the inner surface of the rear cover body 2c, and the inclined surface forming body 14 may be used as the guide portion 8.

  In the present embodiment, the load unit 4, the return unit 7 and the unloaded unit 6 are filled with a large number of rolling elements 3 (90% or more of the effective area of the load unit 4, the return unit 7 and the unloaded unit 6). The amount of the rolling element 3 is arbitrary when the sliding body 2 is slid in the direction of the arrow in FIG. 3 is moved to the no-load portion 6 via the rearward return portion 7 on the right side in FIG. 3, and further from the no-load portion 6 to the load portion 4 via the front return portion 7 on the left side in FIG. What is necessary is just to set to the quantity which can return and move.

  Specifically, by placing the rolling elements 3 in an amount that occupies more than half of the effective area of the load part 4, the return part 7 and the no-load part 6, the load part 4 rolls and moves without load. The rolling elements 3 arranged in the no-load part 6 are pressed by the rolling elements 3 moving to the part 6 and supplied to the load part 4.

  In order to achieve a very good sliding movement while having a configuration without a rolling element cage, it was confirmed that the rolling elements 3 in an amount occupying an area of 2/3 or more of the effective area should be provided. ing.

  As shown in FIG. 7, the rolling element 3 of this embodiment is configured such that the sliding body 2 including the base body 2 a, the front cover body 2 b, and the rear cover body 2 c is placed on the shaft 1, and the shaft 1 is in a half-drawn state. In this way, it is introduced from A between the front cover body 2 b and the shaft 1, and is arranged in the load part 4, the return part 7 and the no-load part 6.

  For example, the base body 2a fitted with the front cover body b is fitted on the shaft 1, the rear cover body 2c is fitted on the base body 2a with a gap where the rolling elements 3 can be disposed, and the lower half gap is sealed. In this state, the rolling element 3 is disposed from the gap to the load part 4, the return part 7 and the no-load part 6, or the rolling element disposition window (on the front cover body 2b or the rear cover body 2c or both of them) ( The rolling elements 3 may be arranged by other methods, such as providing an illustration (not shown).

  In this embodiment, the shaft 1 having a circular shape in cross section and the cylindrical sliding body 2 fitted to the shaft 1 are employed, but other configurations, for example, the shaft 1 having a square shape in cross section. And a rectangular tube-shaped sliding body 2 fitted on the shaft 1 may be employed, or a structure that performs either linear sliding or rotational sliding may be employed.

  Since the present embodiment is configured as described above, when the sliding body 2 is slid and moved with respect to the shaft 1, the rolling element 3 rolls by receiving a load at the load portion 4, and the return portion 7 returns the rolling body 3. Then, it moves to the no-load portion 6, is pressed by the rolling element 3 from the load portion 4 in the no-load portion 6, returns by the return portion 7, and moves to the load portion 4.

  Accordingly, the rolling element 3 of the load part 4 and the rolling element 3 of the unloaded part 6 can circulate and achieve good sliding, without the rolling element retainer. Since there is no vessel, the structure is simplified, and durability and productivity can be improved.

  In addition, the fixing screw 11 produces an action of securely fixing the front cover body 2b and the rear cover body 2c to the base body 2a, and an action of achieving good sliding by guiding the movement of the rolling element 3, and correspondingly cost. It excels in productivity and productivity.

  Further, by disposing an appropriate amount of the rolling element 3, the rolling element 3 disposed in the no-load part 6 is pressed by the rolling element 3 that rolls and moves the load part 4 to the no-load part 6. Thus, the action of supplying to the load portion 4 is almost certainly achieved each time the sliding body 2 slides, and a very good sliding movement can be achieved even though there is no rolling element holder. become.

  Further, in this embodiment, the front cover body 2b and the rear cover body 2c are fixed to the base body 2a, and the rolling elements 3 are disposed around the base body 2a. Therefore, the assembly is extremely easy and the productivity is high. It will be excellent. In addition, the number of parts is reduced, and thus a highly rigid and highly accurate sliding device can be easily manufactured.

  Therefore, the configuration that allows the sliding body to perform linear sliding and / or rotational sliding at the same time can be realized at a low cost with a very simple configuration without the need for any complicated configuration. It becomes a typical sliding device.

It is a schematic explanatory side view in which a part of a conventional example is cut out. It is a schematic explanatory exploded perspective view of a present Example. It is a schematic explanatory sectional drawing of a present Example. It is an expansion schematic explanatory drawing of the guide part of a present Example. It is a schematic explanatory plan view of a present Example. It is an expansion schematic explanatory drawing of the guide part of another example. It is a schematic explanatory perspective view of a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 axis | shaft 2 slide body 2a base | substrate 2b front cover body 2c back cover body 3 rolling element 4 load part 6 no load part 7 return part 8 guide part 9 positioning protrusion
10 groove

Claims (13)

  A sliding body is provided so as to slide relative to the shaft, and a plurality of rolling elements are disposed between the shaft and the sliding body, and the rolling elements roll between the shaft and the sliding body. The sliding device is configured to move and move, and the inner peripheral surface of the sliding body is provided with a load portion that includes the inner peripheral surface and the outer peripheral surface of the shaft and in which the rolling element is disposed, A non-load portion in which a rolling element is disposed is provided outside the load portion. The no-load portion and the load portion are communicated with each other via a return portion from which the rolling element returns. A sliding device characterized by being in a state of receiving a load at a part position and being in a no-load state at the no-load part position.   The sliding device according to claim 1, wherein the return portion is provided in front of and behind the sliding body.   The sliding device according to any one of claims 1 and 2, wherein the rolling elements in the load portion are configured to be aligned in a straight line in a length direction of the shaft.   The sliding device according to any one of claims 1 to 3, wherein the sliding body includes a base body, a front cover body provided from the front side of the base body, and a rear cover body provided from the rear side. A sliding device characterized in that a no-load portion and a return portion are formed between a base body, a front cover body, and a rear cover body by providing a cover body and a rear cover body.   5. The sliding device according to claim 4, wherein the return portion has a front return portion formed by the front end portion of the base body and the front cover body, and a rear return portion formed by the rear end portion of the base body and the rear cover body. A sliding device characterized by being configured.   6. The sliding device according to claim 4, wherein the base body is configured such that the shaft is inserted, and the front cover body and the rear cover body are configured to be fitted to the base body. The outer peripheral surface is provided with positioning ridges extending in the length direction of the base body, and the front cover body and the rear cover body are provided with concave grooves that engage with the positioning ridges. A sliding device characterized.   7. The sliding device according to claim 6, wherein the positioning protrusion is set in a shape such that the effective area of the load portion and the effective area of the no-load portion are substantially the same area. .   The sliding device according to any one of claims 4 to 7, wherein a guide capable of guiding the movement of the rolling elements moving from the load part to the no-load part and from the no-load part to the load part at the front and rear of the base body. A sliding device characterized in that a part is provided.   9. The sliding device according to claim 8, wherein the guide portion projects from an end portion of the positioning protrusion in the extending direction.   The sliding device according to any one of claims 1 to 9, wherein the load portion, the return portion, and the no-load portion are configured such that a plurality of rolling element rows formed by a large number of rolling elements are arranged. A sliding device characterized by the above.   The sliding device according to any one of claims 1 to 10, wherein an arbitrary rolling element in the load portion moves to the no-load portion via the return portion, and further from the no-load portion to the return portion. A sliding device configured to move back to a load portion.   The sliding device according to any one of claims 1 to 11, wherein the rolling element disposed in the load portion is configured to roll on the outer periphery of the shaft. . The sliding device according to any one of claims 1 to 12, wherein a shaft having a circular shape in cross section is adopted as a shaft, and a cylindrical shape fitted on the shaft is adopted as a sliding body, the sliding body. Is configured to perform linear sliding or rotational sliding or both at the same time.

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