Mounting member and motion guide device having the same

Abstract

The present invention provides a mounting component and a motion guide device having the mounting component, which can reliably and easily mount a sensor such as a vibration sensor on a movable component such as a nut of the motion guide device without removing the motion guide device from the device and without post-processing even when a motion guide device such as a ball screw has been mounted on the device. A mounting component is provided for mounting a sensor on a motion guide device, the motion guide device having an axis member extending in a length direction and a movable component mounted to be movable in the length direction relative to the axis member, the mounting component having: a fixing portion that can be fixed to a fastening connection hole formed in the movable component; and a sensor mounting portion for mounting the sensor.

Description

Technical Field

[0001] The present invention relates to a mounting member for mounting a sensor on a motion guide device such as a ball screw, and a motion guide device having the mounting member. Background Art

[0002] Conventionally, sensors such as vibration sensors and magnetic sensors are mounted on moving members such as the nut of a ball screw in order to monitor the state of a motion guide device such as a ball screw or detect the position of the moving member.

[0003] For example, the ball screw described in patent document 1 comprises: a vibration sensor, which is installed on the ball screw nut and detects vibration in a ball screw having a ball screw shaft and a ball screw nut; a filtering unit, which filters vibration data of a ball screw abnormality detection frequency band based on vibration data detected by the vibration sensor; and an abnormality detection unit, which detects abnormality of the ball screw based on the vibration data of the ball screw abnormality detection frequency band filtered by the filtering unit.

[0004] According to such a ball screw, vibration data of the abnormal detection frequency band of the ball screw in normal state is stored, and the vibration data of the abnormal detection frequency band of the ball screw in normal state is compared with the vibration data of the abnormal detection frequency band of the ball screw after filtering, and the abnormality of the ball screw is determined based on the comparison data of the compared vibration data. Therefore, the abnormality of the ball screw can be detected more accurately.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 6051606 Summary of the invention

[0008] Problems to be solved by the invention

[0009] However, in order to accurately detect the vibration data of the nut, the previous sensor installation method directly installed it on the axial end face of the nut and the flange part formed on the nut. According to this installation method, the axial end face and flange part of the nut are tapped and then fastened by a fastening mechanism such as screws.

[0010] According to such an installation method, when the ball screw is already installed in the device, tapping and the like cannot be performed while the ball screw is installed in the device, and the ball screw needs to be removed from the device once for post-processing, which requires very troublesome work. In addition, it is also considered to use magnets and adhesives to fix the sensor during installation, but according to such an installation method, there is a problem that the sensor may fall off due to vibration and the like during long-term use.

[0011] The present invention is completed to solve the above-mentioned problems, and its purpose is to provide a mounting component and a motion guide device equipped with the mounting component. Even if a motion guide device such as a ball screw has been installed in the device, there is no need to remove the motion guide device from the device and no post-processing is required. Sensors such as vibration sensors can be reliably and easily installed on movable components such as nuts of the motion guide device.

[0012] Solutions to Solve Problems

[0013] The mounting component of the present invention for solving the above-mentioned problems is a mounting component, which mounts a sensor on a motion guiding device, wherein the motion guiding device has an axial component extending in a length direction and a movable component mounted to be movable along the length direction relative to the axial component, and is characterized in that the mounting component comprises: a fixing portion, which can be fixed to a fastening hole formed in the movable component by a fastening mechanism; and a sensor mounting portion, on which the sensor is mounted.

[0014] Effects of the Invention

[0015] According to the mounting component of the present invention, since it includes a fixing portion that can be fixed to a fastening connection hole formed in a movable component and a sensor mounting portion for mounting a sensor, the sensor can be reliably and easily mounted without removing the motion guide device from a device on which the motion guide device is mounted and without performing post-processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a perspective view of a device and a motion guide device to which the mounting member according to the embodiment of the present invention is mounted.

[0017] Figure 2 It is a partially cutaway perspective view of a motion guide device to which a mounting member according to an embodiment of the present invention is mounted.

[0018] Figure 3 It is a perspective view of a mounting member according to an embodiment of the present invention.

[0019] Figure 4 It is a side view of the mounting member according to the embodiment of the present invention.

[0020] Figure 5 It is a rear view of the mounting member according to the embodiment of the present invention.

[0021] Figure 6 It is an exploded view showing the installation procedure of the installation member according to the embodiment of the present invention. DETAILED DESCRIPTION

[0022] Hereinafter, embodiments of the mounting member of the present invention will be described with reference to the accompanying drawings. It should be noted that the following embodiments are not limited to the inventions involved in each technical solution, and the combination of features described in the embodiments may not all be essential technical features of the present invention.

[0023] Figure 1 is a perspective view of a device and a motion guide device equipped with a mounting member according to an embodiment of the present invention, Figure 2 is a partially cutaway perspective view of a motion guide device for installing a mounting member according to an embodiment of the present invention, Figure 3 is a perspective view of a mounting member according to an embodiment of the present invention, Figure 4 is a side view of a mounting member according to an embodiment of the present invention, Figure 5 is a rear view of the mounting member according to the embodiment of the present invention, Figure 6 It is an exploded view showing the installation procedure of the installation member according to the embodiment of the present invention.

[0024] like Figure 1 As shown, the mounting member 30 of this embodiment is a member used to mount the sensor 20 on the ball screw 10 as a motion guide device installed in the device 1. The mounting member 30 is fastened together with the fastening connection mechanism 2 that mounts the ball screw 10 on the device 1, and the sensor 20 is mounted on the mounting member 30 through the sensor mounting mechanism 21.

[0025] The sensor 20 includes a housing that accommodates a sensor substrate, a shielded cable that is connected to the sensor substrate, and a cable bushing that is attached to one end of the shielded cable and holds the shielded cable fixed to the housing.

[0026] The housing is preferably divided into a divided body including an upper shell and a lower shell, and the upper shell and the lower shell are preferably formed of metal such as aluminum alloy. The upper shell and the lower shell form a sensor substrate storage portion for storing the sensor substrate.

[0027] like Figure 2 As shown, the ball screw 10 on which the mounting component 30 of the present embodiment is mounted has a screw shaft 11 as an axial component extending in the length direction and having a spiral ball rolling groove 13 formed therein, a nut component 12 as a movable component and having a load rolling groove 14 corresponding to the ball rolling groove 13 formed therein, and a return pipe 15 fixed to the nut component 12.

[0028] The nut member 12 is installed so as to be able to move axially relative to the screw shaft 11 by means of the balls 16 rolling between the ball rolling grooves 13 and the load rolling grooves 14. In addition, the nut member 12 is formed with a flange 17 extending in the radial direction on the axial end surface, and fastening holes 18 are formed at predetermined intervals on the flange 17. In addition, the nut member 12 of the ball screw 10 to which the mounting member 30 of the present embodiment is mounted is formed with three fastening holes 18 on both sides of the flange 17 in a manner symmetrical to each other about the central axis of the screw shaft 11.

[0029] The return tube 15 is fixed to the nut member 12 in such a manner that it passes over the ball rolling groove 13 of the screw shaft 11 by several turns. The balls 16 scooped up from the ball rolling groove 13 of the screw shaft 11 by the end of the return tube 15 roll in the return tube 15 and are sent into the ball rolling groove 13 several turns ago, thereby the balls 16 circulate infinitely in the nut member 12.

[0030] The return pipe 15 is preferably formed by combining a pair of pipe halves formed into a roughly semicircular cross-section, and more preferably each pipe half is made by injection molding of a synthetic resin. In addition, it is preferred that each pipe half is formed with a concave groove that serves as a ball return passage, and on the other hand, a guide groove is formed in the concave groove to guide a retainer that retains a plurality of balls 16. In addition, as an infinite circulation method, a method of using a return pipe is described, but the infinite circulation method is not limited to the return pipe, and various circulation methods can be used. For example, the end plate installed at the axial end of the nut member 12 can also have a circulation structure, and a method of using a reverser to return the ball 16 to a specified number of turns can also be used.

[0031] Next, refer to Figures 3 to 5 , the mounting member 30 of the present embodiment is described. The mounting member 30 of the present embodiment is formed in a manner corresponding to one side of the flange 17 of the nut member 12, and is formed in a manner corresponding to the fastening hole 18: a fixing portion 31; and a sensor mounting portion 32, which is formed with a sensor mounting hole 33 for mounting the sensor 20.

[0032] The fixing portion 31 is as follows Figure 1 As shown, the sensor mounting portion 32 is formed to correspond to the upper and lower fastening holes 18 of the three fastening holes 18 of the nut member 12, and an escape portion 34 is formed on the surface opposite to the nut member 12 to prevent contact with the fastening mechanism 2 fastened to the central fastening hole 18.

[0033] In this way, by forming the fixing portion 31 corresponding to two or more non-adjacent fastening holes 18, even when the fastening mechanism 2 is removed from the device 1, the sensor 20 can be installed without removing other fastening mechanisms 2, so that the positional deviation of the nut member 12 is not easy to occur, and the installation accuracy can be maintained. In addition, by forming the fixing portion 31 and the avoidance portion 34 in this way, the installation surface of the sensor 20 can be ensured and the sensor sensitivity can be maintained.

[0034] In order to maintain the sensitivity of the mounted sensor 20, the sensor mounting portion 32 is formed so that the mounting surface of the sensor 20 is flat. Figure 4 As shown, in order to ensure the sensor sensitivity, the thickness T of the sensor mounting portion 32 is preferably formed thicker. However, if the sensor mounting portion 32 is too thick, the stroke of the nut member 12 is reduced. Therefore, in order to take into account both the sensor sensitivity and the stroke, the thickness T of the sensor mounting portion 32 is preferably configured to be approximately 1.2 times the thickness of the sensor 20 to be mounted, and more preferably configured to be approximately 1.5 times the thickness of the sensor 20.

[0035] In addition, if Figure 4 as well as Figure 5 As shown, when the cover member 19 is protrudingly mounted on the axial end surface of the nut member 12, an interference prevention groove 35 is preferably formed to prevent interference with the cover member 19. The shape of the interference prevention groove 35 can be appropriately changed according to the shape of the cover member 19.

[0036] Next, refer to Figure 6 The installation procedure of the mounting member 30 of the present embodiment is described. First, the sensor 20 is mounted on the mounting member 30 by fastening the sensor mounting mechanism 21 to the sensor mounting hole 33 formed in the sensor mounting portion 32. Then, the fastening mechanism 2 fastened together for mounting the mounting member 30 is removed from the ball screw 10 mounted on the device 1 via the fastening mechanism 2. At this time, as shown in FIG. Figure 6 As shown, the fastening mechanism 2 is preferably removed from two upper and lower fastening holes 18 that are not adjacent to each other among the three fastening holes 18 formed on one side.

[0037] Next, the mounting member 30 is mounted on the flange 17 of the nut member 12, and the fastening mechanism 2 is inserted through the fixing portion 31 to be fastened together with the nut member 12. At this time, the fastening mechanism 2 can be used as it is, or a fastening mechanism that is longer than the fastening mechanism 2 removed by the thickness of the fixing portion 31 can be used.

[0038] At this time, the fastening mechanism 2 fastened to the fastening holes 18 corresponding to the fixing portions 31 is mounted so as to straddle the escape portion 34 of the mounting member 30 , thereby preventing interference between the fastening mechanism 2 and the mounting member 30 .

[0039] In this way, after the sensor 20 is mounted on the mounting member 30 , the sensor 20 can be mounted on the nut member 12 together with the mounting member 30 . Therefore, the sensor 20 can be mounted without impairing workability.

[0040] In this way, two fixing portions 31 are formed, and a fastening mechanism 2 is formed to cross the fixing portions 31 through the avoidance portion 34. Therefore, the removal of the fastening mechanism 2 accompanying the installation of the sensor 20 can be performed only through the two fastening mechanisms 2 corresponding to the fixing portions 31, and the other fastening mechanisms 2 can remain fastened to the device 1. Therefore, the sensor 20 can be installed on the nut member 12 without causing positional displacement on the nut member 12 as the fastening mechanism 2 is removed.

[0041] Furthermore, the fastening holes 18 for common fastening can share the fastening holes 18 for fastening the nut member 12 to the device 1 , so that the sensor 20 can be mounted on the ball screw 10 in a state of being mounted on the device 1 without performing post-processing such as tapping.

[0042] It should be noted that, in the above-mentioned embodiment, the case of using a ball screw as a motion guide device is described, but the motion guide device is not limited to a ball screw, for example, a ball spline in which a spline shaft is applied to a shaft member and a movable member that can move along the spline shaft can also be applied. In addition, in the above-mentioned embodiment, the case of forming three fastening holes 18 on both sides of the nut member 12 and forming six in total is described, but the number of fastening holes is not limited thereto, for example, it can be appropriately changed to 4, 8, etc. It is clear from the description of the technical solution that the method of applying such changes or improvements is also included in the technical scope of the present invention.

[0043] Description of reference numerals:

[0044] 10 ball screw (motion guide device), 11 screw shaft (shaft component), 12 nut component (moving component), 17 flange, 18 fastening connection hole, 20 sensor, 30 mounting component, 31 fixing part, 32 sensor mounting part, 34 avoidance part.

Claims

1. A mounting member for mounting a sensor on a motion guide device, wherein the motion guide device has an axis member extending in a length direction and a moving member mounted to be movable in the length direction relative to the axis member and having a through hole for inserting the axis member, and a fastening hole for fastening the moving member to a target member on which the moving member is mounted is formed on the moving member, characterized in that: The mounting member comprises: a fixing portion that can be fixed to the fastening hole formed in the moving member by a fastening mechanism; and a sensor mounting portion for mounting the sensor, The fixing portion is formed corresponding to two or more non-adjacent fastening holes among the plurality of fastening holes. A relief portion is formed on a surface of the sensor mounting portion that faces the movable member to prevent contact with a fastening mechanism fastened to another fastening hole that does not correspond to the fixed portion, and the sensor is mounted so as to straddle the fastening mechanism fastened to the other fastening hole.

2. The mounting member according to claim 1, characterized in that The fixing portion is formed in two or more portions.

3. The mounting member according to claim 1 or 2, characterized in that: The thickness of the sensor mounting portion is 1.2 times or more of the thickness of the sensor.

4. The mounting member according to claim 1 or 2, characterized in that: The fixing portion is attached to the fixing hole and the counterpart member by fastening the fixing portion to the fixing hole through the fastening mechanism that fixes the fixing portion to the fixing hole.

5. A motion guiding device, characterized in that: The motion guide device includes a moving member having the mounting member according to any one of claims 1 to 4.

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