JP3118005U - Ball / nut return member fixing structure - Google Patents

Abstract

It is an object of the present invention to simplify processing and assembling procedures, and to achieve reduction of components and cost reduction.
A fitting groove 13 extending from the outer surface to the inside is opened in a ball nut main body 1 to be used for fitting a reflux member 2, and the fitting groove allows the circumferential and axial directions of the reflux member to be set. In addition to restricting the position, a fitting structure is provided corresponding to the return member and the adjacent wiper ring 15, the radial position of the adjacent return member is restricted by attaching the wiper ring, and the return member is placed in the nut. Fix it.
[Selection] Figure 4

Description

  The present invention relates to a ball-nut return member fixing structure, and more particularly to a ball-nut return member fixing structure capable of effectively reducing the number of components and reducing the cost by fixing the return member with a wiper ring. is there.

  FIG. 1 is a sectional view of a conventional ball screw. The ball screw 9 is mutually fitted with the ball nut, and relative movement occurs when the ball 7 rolls between them. The ball nut includes a main body 8 having a hollow tubular shape, and a spiral groove 80 for rolling the ball 7 is provided on the inner periphery thereof. In the main body 8, a reflux hole 81 is installed across the spiral groove, and a reflux member 82 is provided at each end of the reflux hole 81. Each reflux member 82 has a reflux path 821, and both ends of each reflux path 821 are connected to a spiral groove 80 and a reflux hole 81, respectively, so that the ball 7 can roll and reflux.

  This will be described with reference to FIG. In order to allow the main body 8 and the reflux member 82 to be stably coupled, the main body 8 is provided with a fitting groove 83 corresponding to the outer shape of the reflux member 82 so that the reflux member 82 is directed from the outside to the inside. It can be fitted in the axial direction. In addition, the retaining ring 841 is formed by opening the endless groove 84 corresponding to the position where the reflux member 82 of the main body 8 is provided. As shown in FIG. 3, the C-shaped fitting ring 85 is connected to the endless groove 84. When the ring is fitted, the return member 82 is positioned in the axial direction by being stopped by the stop ring 841 to ensure that both ends of the return path 821 of the return member 82 are precisely connected to the spiral groove 80 and the return hole 81, respectively. is doing.

2 and 3, wiper rings 86 are attached to both ends of the main body 8 to prevent foreign matter from entering the main body 8.
In the above-described ball-and-nut structure, the endless groove 84 is opened and an extra C-shaped fitting ring 85 is attached so that the main body 8 and the return member 82 can be stably coupled. 82 must be positioned, which complicates processing and assembly procedures and increases manufacturing costs.

Further, in the above-described structure, endless grooves 84 are opened at both ends of the main body 8 and a space must be reserved in advance for the retaining ring 841 having a certain thickness, so that the size reduction of the main body 8 is difficult. This is disadvantageous for the compact design; if the outer diameter of the main body 8 is too small, the main body 8 tends to burst from the endless groove 84, causing a problem in product quality.
Therefore, in order to achieve cost reduction and size reduction, the ball and nut structure must certainly be further improved.

  The main object of the present invention is to open a fitting groove extending from the outer surface to the inside of the ball nut body so as to fit the reflux member and correspond to the reflux member and the wiper ring. The fitting structure is provided, and the adjacent reflux members are fixed by attaching the wiper ring, thereby simplifying the processing and assembling procedures, and achieving reduction of components and cost reduction.

  The next object of the present invention is to bring the wiper ring close to the return member and to effectively reduce the size of the ball nut by the structural design in which the return member is fixed by the wiper ring.

  The ball and nut end plug fixing structure that can achieve the above-mentioned devised object is to open a fitting groove extending from the outer surface corresponding to each reflux member to the inside of the ball and nut body, and to fit each reflux member. The position in the circumferential direction and the axial direction is limited, and an endless groove communicating with the fitting groove of each reflux member is opened in the main body, so that the wiper ring can be fixed respectively. By providing a mating structure corresponding to the adjacent wiper rings, the adjacent reflux members can be fitted when each wiper ring is fixed to each endless groove, so that the radial direction of the reflux members Limit the position and fix the reflux member. As described above, the structure in which the return member is fixed by the wiper ring effectively simplifies the processing and assembling procedures, and can reduce the number of components and reduce the cost.

  That is, the first device of the present application has a main body having a hollow tubular shape, provided with a spiral groove on its inner diameter, rolled a ball therein, and provided a reflux hole in the main body across the spiral groove. In order to fit the reflux members respectively, fitting grooves extending from the outer surface to the inside are installed at both ends of the reflux holes of the main body, respectively, and the circumferential direction and the axial direction of each reflux member by each fitting groove Each of the reflux members is provided with a reflux path, and both ends of each reflux path are connected to a spiral groove and a reflux hole, respectively, and the ball circulates and refluxes therein. Each end of the main body is provided with an endless groove communicating with the fitting groove, and each wiper ring is fixed and adjacent to each return member. By providing the fitting structure corresponding to the wiper ring, when each wiper ring is fixed to each endless groove, the adjacent reflux member can be fitted by each wiper ring and the reflux member can be fixed This is a structure for fixing a ball-nut return member.

  In the second device of the present application, each endless groove corresponding to the main body is provided with one or more bolt holes penetrating in the radial direction, and the bolts are respectively screwed therein to fix the wiper rings. The ball-nut return member fixing structure according to the first aspect of the present invention.

  In the third device of the present application, flanges are provided on the sides where the respective wiper rings and the adjacent reflux members are in contact with each other, and an arc-shaped concave tank is provided on the flange of the adjacent wiper ring corresponding to each of the return members. The ball and nut return member according to the first aspect, wherein the wiper ring flange is fitted into an arc-shaped concave tank of the adjacent return member to form the above-described fitting structure. It is a fixed structure.

The present invention omits the components of the C-type fitting ring and the structure of the endless groove and the retaining ring installed for attaching the C-type fitting ring.
Therefore, the structure of the present invention can simplify the processing and assembly procedures, reduce the number of components, and reduce the cost.
Further, by simplifying the structure of the endless groove and the retaining ring, the wiper ring can be brought close to the reflux member, and the size of the main body can be effectively reduced.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  4 to 6 show an embodiment of a ball-nut return member fixing structure according to the present invention. In this embodiment, the ball nut has a body 1 having a hollow tubular shape, provided with a spiral groove 11 in its inner diameter, allows a ball (not shown) to roll therein, and spirals into the body 1. A reflux hole 12 is installed across the groove 11. In order to fit the reflux members 2 respectively, fitting grooves 13 extending from the outer surface toward the inside are installed at both ends of the reflux hole 12 of the main body 1. The cross-section of each fitting groove 13 corresponds to the outer shape of each reflux member 2 and the circumferential direction and the axial direction of each reflux member 2 are limited by each fitting groove 13.

  Each reflux member 2 includes a reflux path 21, and both ends of each reflux path 21 are connected to the spiral groove 11 and the reflux hole 12, respectively, so that the ball circulates and refluxes therein.

  Both ends of the main body 1 are provided with endless grooves 14 communicating with the fitting grooves 13, respectively, and each wiper ring 15 is fixed to the side of the wiper ring 15 that contacts the adjacent reflux member 2. Each of the flanges 151 of the wiper ring 15 adjacent to the respective reflux members 2 is provided with an arc-shaped concave tank 22 so that each wiper ring 15 is connected to each endless groove 14. As shown in FIG. 5, the flange 151 of each wiper ring 15 is fitted in the arc-shaped concave tank 22 of the adjacent reflux member 2 to fix the radial position of each reflux member 2 as shown in FIG. .

  Each endless groove 14 corresponding to the main body 1 is provided with one or more bolt holes 16 penetrating in the radial direction, and bolts 17 are screwed therein to fix the wiper rings 15. To do. The external appearance of the main body 1 and the reflux member 2 of the present invention is as shown in FIG.

In the present invention, a fitting groove 13 extending from the outer surface toward the inside is opened in the main body 1 of the ball screw so that the reflux member 2 is fitted, so that the reflux member 2 is fitted into the fitting groove 13. If it fits in, it will be enclosed by the fitting groove 13, and as shown in FIG. And the flange 151 provided in the wiper ring 15 and the isolated concave tank 22 provided in the reflux member 2 adjacent to each other have a structure in which they are fitted to each other.
Accordingly, when the wiper ring 15 is attached and fixed to the endless groove 14, the position of the reflux member 2 adjacent to the wiper ring 15 in the radial direction D is limited by the fitting structure, and the reflux member 2 is attached to the main body. Secure in 1

  Compared with the prior art, the present invention omits the structure of the C-type fitting wheel 85 and the structure of the endless groove 84 and the retaining ring 841 installed for attaching the C-type fitting wheel. Obviously, the structure of the present invention simplifies the processing and assembling procedure, reduces the number of components, and reduces the cost. In addition, by simplifying the structure of the endless groove 84 and the retaining ring 841, the wiper ring 15 can be brought close to the reflux member 2 and the size of the main body 1 can be effectively reduced.

  It should be particularly emphasized that in order to fix the return member to the nut for a long time, it must be fixed by an extra fixing part (for example, a C-type snap ring or a bolt), Corresponding structures (eg, endless grooves, bolt holes, etc.) must be added with the fixed parts, such structures are clearly cumbersome and inconvenient and require more installation space.

  The structure of the present invention breaks down the conventional technical idea, and makes it easier to manufacture and assemble the return member and the nut by fixing the return member using an existing wiper ring.

  Of course, there are different examples of the present invention, but this is a slight change in detail. For example, the flange of the wiper ring and the arc-shaped concave tank provided in the adjacent reflux member are replaced with each other, so that the wiper ring A ring-shaped concave tank is formed on the top, and a corresponding arcuate flange is installed on the reflux member. Even in this case, a structure that fits together can be configured in the same manner as in the previous embodiment. The effect can be achieved.

  The disclosure of the above-described embodiments is for explaining the present invention, and does not limit the present invention. Therefore, changes in numerical values, replacement of equivalent elements, and the like belong to the category of the present invention.

It is the partial combination cross-sectional schematic of the conventional ball screw. It is a perspective exploded view of a conventional ball screw nut and a reflux member. It is the combined cross-sectional schematic of the nut and return member of the conventional ball screw. It is a perspective exploded view of a ball screw nut and a reflux member of the present invention. 3 is a schematic view of a wiper ring and a reflux member of the present invention fitted together. 1 is an external perspective view of the present invention.

Explanation of symbols

1 ··································································································································································· 151... Flange 16... Bolt hole 17... Bolt 2... Reflux member 21. ... Ball 8 ... Body 80 ... Spiral groove 81 ... Return hole 82 ... Return member 821 ... Return path 83 ...・ Fitting groove 84... Endless groove 841... Retaining ring 85... C-type fitting ring 86... Wiper ring 9.

Claims (3)

It has a main body that has a hollow tubular shape, has a spiral groove on its inner diameter, rolls a ball in it, and installs a reflux hole that crosses the spiral groove in the main body,
In order to fit each of the reflux members, the fitting grooves extending from the outer surface toward the inside are installed at both ends of the reflux holes of the main body,
Each fitting groove is designed to limit the circumferential direction and axial position of each reflux member,
Each reflux member has a reflux path,
Both ends of each reflux path are connected to a spiral groove and a reflux hole, respectively, so that the ball circulates and refluxes therein,
Each end of the main body is provided with an endless groove communicating with the fitting groove, and the wiper ring is fixed respectively.
In addition, by providing a fitting structure corresponding to the wiper ring adjacent to each reflux member, when each wiper ring is fixed to each endless groove, the adjacent reflux member is fitted by each wiper ring. The reflux member is configured to be fixable,
Ball / nut return member fixing structure.   Each endless groove corresponding to the main body is provided with one or more bolt holes penetrating in the radial direction, and the bolts are screwed therein to fix the wiper rings. Item 2. A structure for fixing a return member of a ball and nut according to Item 1.   Each wiper ring is provided with a flange on the side where the adjacent reflux member comes into contact with each other, and each reflux member is provided with an arc-shaped concave tub on the flange of the adjacent wiper ring corresponding to each wiper ring. 2. The ball nut return member fixing structure according to claim 1, wherein the flange of the ring is fitted into an arc-shaped concave tank of the adjacent return member to constitute the aforementioned fitting structure.

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