Gyro bearing device

Abstract

To provide a gyroscope bearing device which adopts a ball bearing for the purpose of performance improvement of the gyroscope and enables the fitting and assembly of the gyroscope bearing device to be facilitated.SOLUTION: Outer diameters of both ends of a shaft of a disc are engageable without press-fitting by making a deep groove ball bearing inner ring inner diameter dimension-(30 μm or larger). Both sides in the direction orthogonal to the position where a bearing box of a ring is attached are compressed to extend the axial direction of the disc. The shaft of the disc is housed between two deep groove all deep bearings to release compression and extension. Both ends of the disc shaft are engaged in the deep groove ball bearing inner ring. Thus, a step of engaging the shaft with the deep groove ball bearing is a post step. A deep groove ball bearing shaft bearing box can be formed into a simple shape, and its working is simplified. Attachment of the deep groove ball bearing shaft bearing box to the ring, and assembly of the disc and its shaft and of the ring fitted with the bearing shaft bearing box become simple. Consequently, a gyroscope bearing device simplifies adoption of the deep groove ball bearing as the bearing.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a bearing that employs ball bearings for the purpose of improving the performance of a gyroscope and that facilitates the installation and assembly of the bearing. [Background technology]

[0002] A gyroscope (Figure 6) is a device whose main components consist of a disk and its axis (hereafter referred to as the "disk axis"), bearings supporting both ends of the axis, and a ring securing the bearings. A string is wound around the axis, and pulling the end of the string rotates the disk. While the disk is rotating at high speed, it has the property of directionality, meaning that the disk axis maintains a constant direction even if the orientation of the outer ring changes. Also, when a force is applied to change the angle of the rotating disk axis, the axis acts in a 90-degree different direction, changing its angle. (Maehata Yukiya, "Gyrocompass and Autopilot," Seizando Publishing, 2013). Another example is the toy globe (Patent No. 6033481, Figure 1). While the disk is rotating at high speed, it maintains its orientation without tipping over even when it experiences a swinging motion known as precession. These two types of devices are defined as gyros, excluding powered gyrocompasses and electronic gyro sensors that detect angular velocity.

[0003] Gyro bearings generally have a simple structure in which the convex portions at both ends of the disk shaft are fitted into the concave portions of the bearing attached to the ring. Since the duration of rotation due to the disk's inertia is affected by the bearing, improvements in bearings are being made.

[0004] In recent years, small ball bearings (deep groove ball bearings, hereafter referred to as "bearings") have been produced with inner diameters of 2.5 mm for the inner ring and outer diameters of 6.0 mm for the outer ring. It is thought that using a bearing would be an effective way to improve performance, as the drawback of short rotation duration due to the inertia of the disk. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6033481 [Patent Document 2] Actual opening Showa 54-077888 [Non-patent literature]

[0006] [Non-Patent Document 1] "Gyrocompass and Autopilot" by Yukiya Maehata, Seizando Bookstore, 2013 Summary of the Invention [Problem to be solved by the invention]

[0007] The problem to be solved is that when a bearing is used in a bearing, it is not easy to process, attach, and assemble the bearing housing.

[0008] Generally, both the shaft and the outer ring of a bearing are fitted by press-fitting. When fitting the shaft into the inner ring of a bearing, the shaft is fixed and the inner ring is used as the force point. When fitting the outer ring of a bearing into the housing, the housing is fixed and the outer ring is used as the force point. This is to prevent unexpected force from being applied to the balls inside the bearing, which could cause damage or breakage. A jig is used to apply pressure to the force point. The disk shaft and inner ring of the bearing, and the outer ring of the bearing and housing are integrated by press-fitting. In this case, attaching the bearing housing to the ring is a later process. This is because once the housing is attached to the ring, the length of the shaft will not fit between the two bearings, making press-fitting impossible. In the assembly process, the disk shaft and bearing, and the bearing and housing are integrated in the previous process. In the subsequent process, the integrated disk shaft, bearing, and housing are attached to the ring in a position diametrically opposite the ring (Figure 3).

[0009] In the pre-processing step of press-fitting the bearing outer ring into the bearing housing, the disk gets in the way of applying pressure to the outer ring at the force point (Fig. 3)c. Furthermore, the bearing housing that is attached to the ring in the post-processing step requires a shape for screws, such as a sector shape, and screw holes. This makes it difficult to process using only cutting on a lathe or other machine, resulting in a complex structure that requires multiple machine tools, such as a milling machine. Furthermore, at least two screws are required to secure one bearing housing, making installation and assembly difficult (Fig. 3)d. [Means for solving the problem]

[0010] The present invention employs a first method in which the outer diameters of both ends of the disk shaft fitted into the inner circumference of the bearing inner ring are looser than the recommended dimensions for clearance fit, and a second method in which the ring is made of elastic metal and compressed in the direction perpendicular to the bearing housing mounting position and stretched in the direction in which the bearing housing is mounted within the range of elastic strain. After the length of the disk shaft is accommodated between the two bearings, the compression and stretching are released to fit the disk shaft onto the bearing inner ring. With these two methods, the process of press-fitting the bearing outer ring into the bearing housing and the process of attaching the bearing housing to the metal ring are considered the previous process, and fitting the disk shaft onto the bearing inner ring is considered the next process. [Effects of the Invention]

[0011] According to the present invention, the bearing housing can be made into a simple shape, making it easy to process. It also makes it easy to attach to the metal ring. It also makes it easy to assemble the disk shaft with the metal ring that integrates the bearing and bearing housing. As a result, bearings can be easily used in the bearing, improving the duration of rotation of the disk due to inertia. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is an explanatory diagram showing an embodiment of a gyro bearing device (Example 1). [Figure 2] FIG. 2 shows the process of fitting the bearing into the bearing housing and the process of attaching the bearing housing to the metal ring by spin crimping. [Figure 3]FIG. 3 is an explanatory diagram of the problem to be solved. [Figure 4] Figure 4 shows a diagram of a bearing housing attached to a metal ring with screws and applied to a geostationary top, as well as an enlarged view of the bearing housing and the screw-fastening portion (Example 2). [Figure 5] FIG. 5 is a view seen from the axial direction, showing the rotating state of the shaft of the disk and the inner ring of the bearing embodying the present invention. [Figure 6] FIG. 6 is a diagram of a conventional device, a gyroscope. DETAILED DESCRIPTION OF THE INVENTION

[0013] The main components of a gyro bearing device are a disk shaft with an axis of rotation running in the inner diameter direction of the metal ring, a metal ring made of elastic metal with two diametrically opposed holes that run through it, a bearing, and a bearing box that secures the bearing.

[0014] Although it has been stated that the shaft is generally fitted into the bearing inner ring by press fitting, the present invention is a special case in which the shaft is fitted into the bearing inner ring without press fitting.

[0015] The outer diameter dimensions of both ends of the shaft of the disk to be fitted into the inner circumference of the bearing inner ring are looser than the recommended clearance fit dimensions (bearing inner ring inner diameter -0μm to -10μm), and are set to the bearing inner ring inner diameter dimension - (30μm or more).This is the first method, which allows fitting without press fitting.

[0016] To elaborate on the fit dimensions of general bearings, there are two types: interference fit and clearance fit. When bearings are mounted on both sides of a rotating shaft, one side is considered a clearance fit. This is the outer diameter dimension of the shaft that is fitted with enough pressure to allow the shaft, which may expand due to thermal expansion, to move relative to the bearing inner ring. The recommended dimensions for inner ring bore diameters of 3.0 mm or less are h5 to h7, and according to JIS Standard B 0401-2 2016, the bearing inner ring inner diameter is -0 μm to -10 μm. The other side where the shaft is fitted into the bearing inner ring is considered an interference fit. This is the outer diameter dimension of the shaft that is fitted with enough pressure to fix the shaft, regardless of expansion due to thermal expansion. The recommended dimensions are k5 to k7, and the bearing inner ring inner diameter +0 μm to +10 μm. When the bearing outer ring is fitted into the bearing housing, an interference fit is used, with the outer ring outer diameter being -0 μm to -10 μm.

[0017] The metal ring is made of elastic metal, such as stainless steel or aluminum. It is a circular ring that supports the disk shaft, and has bearing housings attached at two diametrically opposed points. For this reason, it has holes that run through it in the diametric direction.

[0018] The metal ring is compressed with a jig on both sides in the perpendicular direction at the position where the bearing and bearing housing are attached. The compression dimension is the length of the two ends of the shaft that will be fitted into the bearing inner ring, plus a little extra. In other words, if the fitting length is 2.6 mm, the compression should be 5.2 mm at the two points, plus an extra 0.8 mm, for a total of 6.0 mm. The metal ring is stretched by approximately the same dimension in the direction where the bearing and bearing housing are attached. The length of the disk shaft is placed between the two bearings fixed to the bearing housing, and the compression and stretching are released. The metal ring returns to approximately its original shape. In this way, both ends of the disk shaft are fitted into the bearing inner ring later, forming the second method (Figure 1).

[0019] Using these two methods, the process of press-fitting and fixing the bearing outer ring into the bearing housing is Front Process 1, the process of attaching the bearing housing to the metal ring is Front Process 2, and the process of fitting the disk shaft and the bearing inner ring is Back Process. The disk shaft, bearing, bearing housing, and metal ring are assembled and integrated in that order. The assembly order of Front Process 1 and Front Process 2 is valid because the first and second methods have made fitting the disk shaft a Back Process. This has the effect of simplifying the shape of the bearing housing, making processing and installation easier. Assembly is simplified, and bearings can easily be used for the bearings. Friction is kept low, improving the duration of disk rotation due to the gyro's inertia.

[0020] (Figure 2) a is pre-process 1, where the bearing outer ring is press-fitted into the bearing housing. Because it is a pre-process, only the bearing needs to be fixed to the bearing housing, and the disk does not get in the way. (Figure 2) b is pre-process 2, where the bearing housing with the bearing fixed to it is attached to the metal ring. Because it is a pre-process, no screws are required and it can be attached using spin crimping. The bearing housing can be made into a simple shape, such as a fan shape, as it does not require screw holes. It is attached by passing through holes in two diametrically opposed locations on the metal ring.

[0021] The bearing housing is made of metal such as brass or aluminum, and has a cylindrical structure with two thicknesses that can be machined using only rotary cutting on a lathe. A hole is machined inside the thicker section to fit the bearing outer ring. The smaller the outer diameter, the better, as long as a wall thickness of approximately 0.5 mm is secured to hold the bearing. It should be no larger than the outer diameter of the bearing outer ring + 4.0 mm. The thinner section is used for crimping. Alternatively, as shown in Figure 4b 16, it can be threaded for nut fixing. Furthermore, machining is not limited to cutting, and die-cast molding is also possible. Shapes other than cylindrical are also acceptable. However, it is important that the size and shape do not interfere with the compression and expansion of the metal ring using the second method. This is why the outer diameter of the thicker section is no larger than the outer diameter of the bearing outer ring + 4.0 mm.

[0022] Furthermore, the order of the front-end and rear-end processes by the first and second means and the bearing housing with a simple shape that does not require a sector shape for screw fastening are interrelated. The process order of the invention allows for a simple bearing housing that does not require a sector shape. Also, because the bearing housing is simple and does not require a sector shape, it becomes possible to compress the metal ring, and the order of front-end process 1, front-end process 2, and rear-end process can be achieved by the first and second means.

[0023] To supplement the elastic strain of metals, experiments were conducted using stainless steel and aluminum rings with an outer diameter of 70 mm, an inner diameter of 64 mm, and a width of 10 mm. It was confirmed that after compressing and stretching the ring by approximately 6.0 mm, the residual deformation was less than 0.40 mm. Therefore, the material must be stainless steel or aluminum. The length of the shaft fitted into the bearing inner ring is 2.6 mm, and a clearance of approximately 0.10 mm is planned. The residual deformation of less than 0.40 mm is sufficiently small and not a problem.

[0024] We will now add some details about the rotational state of the disk shaft and bearing inner ring. The shaft and bearing inner ring are fitted with a clearance that is greater than the recommended clearance fit, so they rotate with an offset. There are two types of this state, as shown in Figure 5, viewed from the axial direction. State 1 is a state of core wobble (Figure 5)a, where part of the outer circumference of the shaft and part of the inner circumference of the bearing inner ring are in contact at a single point and rotate at the same cycle. State 2 is a state of no core wobble (Figure 5b), where the contact point between the outer circumference of the shaft and the inner circumference of the bearing inner ring moves as they rotate. We evaluated the operation, lifespan, vibration, noise, etc. for the two types of rotational states. Both were at levels that were acceptable for a gyro device. [Example]

[0025] Figures 1 and 2 are diagrams of a first embodiment of the device of the present invention. Figure 2(a) shows pre-processing 1, in which the bearing housing is fixed and the outer ring of the bearing is pressed into place at the point of application of force to fit the bearing. Figure 2(b) shows pre-processing 2, in which the narrow end of the bearing housing with the bearing fitted in it is inserted through two diametrically opposed holes in the metal ring and crimped to fix it in place. The bearing, bearing housing, and metal ring are integrated in pre-processing 1 and pre-processing 2.

[0026] In the first method, the outer diameter dimensions of both ends of the shaft of the disk to be fitted into the inner circumference of the bearing inner ring are made looser than the recommended clearance fit dimensions (bearing inner ring inner diameter -0μm to -10μm), to the bearing inner ring inner diameter dimension - (30μm or more). This makes it possible to fit it without press-fitting.

[0027] (Figure 1) is the second method. The metal ring is compressed with a jig on both sides in the perpendicular direction at the position where the bearing and bearing housing are attached. The compression dimension is the length of the two ends of the shaft that will be fitted into the bearing inner ring, plus a little extra. In other words, if the fitting length dimension is 2.6 mm, the compression dimension is 5.2 mm at two points, plus an extra 0.8 mm, for a total of 6.0 mm. The metal ring is stretched by approximately the same dimension in the direction where the bearing and bearing housing are attached. The length of the disk shaft is placed between the two bearings fixed to the bearing housing, and the compression and stretching are released. The metal ring returns to approximately its original shape. In this way, both ends of the disk shaft are later fitted into the bearing inner ring.

[0028] In pre-process 1 and pre-process 2, the disk shaft is fitted into the two bearing inner rings fixed to the integrated metal ring bearing housing by two means, the first and second. This is called the post-process. The disk shaft, bearing, bearing housing, and metal ring are assembled and integrated in that order. There is no need to use screws to attach the bearing housing to the metal ring, and it can be attached by spin crimping. The bearing housing can be made into a simple shape, such as a sector shape, without the need for screw-mounting shapes or screw holes. Assembly is simplified, and bearings can easily be used for the bearings. Friction is kept low, improving the duration of disk rotation due to the gyro's inertia. [Example]

[0029] The embodiment in Figure 4 differs from Example 1 in the preceding step 2. A screw thread is provided on the narrow side of the bearing housing into which the bearing is fitted, and the screw passes through two diametrically opposed holes in the metal ring and is then fastened with nuts. [Industrial Applicability]

[0030] The inventions described in claims 1 and 2 of the present invention are suitable for applications in which bearings are mounted diametrically opposite a circular ring. The bearing housing can be made into a simple shape, making it easy to process. Assembly is easy as fitting the shaft and bearing inner ring is a later process. These features make the invention applicable to a wide range of industries as a bearing device. [Explanation of symbols]

[0031] Both ends of one axis 2-axis 3 Discs 4 Bearing box 5 metal rings 6 Compression jig 7. Bearings 8 Press-fit jig 9 Press-fit fixture 10 Crimping jig 11 Caulking fixture 12 Sector-shaped bearing box 13 Screw holes 14 screws 15 Nut 16 threads

Claims

1. A disk with a rotation axis and the axis, and stainless steel, which is an elastic metal, is made of aluminum and has two through holes at opposite diametrical positions. The main parts are the metal ring, the bearing, and the bearing box that fixes the bearing. The disk, the shaft, and the bearing are located inside the metal ring. A method for manufacturing a gyro bearing device, comprising: The outer diameters of both ends of the shaft fitted into the inner periphery of the inner ring of the bearing are The inner diameter of the ring is set to - (30 μm or more), so that it can be fitted without being pressed in. the first means of making it possible to The metal ring is provided with the bearing and the bearings at two diametrically opposed positions. The bearing housing is attached on a line perpendicular to the line passing through the two points. The position where the line intersects with the metal ring is determined toward the center of the metal ring. The bearing housing is attached to the metal ring by compressing the metal ring. The distance between the positions is expanded by approximately the same dimension as the dimension contracted by the compression, and the two The disk is disposed between the bearings fixed to the bearing housings. The length of the shaft is adjusted to release the compression and expansion. The metal ring returns to its original shape, and both ends of the shaft of the disk are fixed to the bearing. The second means is fitted later into the inner ring of the By these two means, the assembly of the bearing, the bearing housing, and the metal ring The shaft of the disk is fitted into the inner ring of the bearing, with the assembly being the previous process. By placing the process as a later process and carrying out the processes in this order, the installation of the bearing and A manufacturing method for a gyro bearing device that is easy to install and assemble.

2. The bearing housing does not require a sectorial or screw hole for attachment to the metal ring. The bearing housing is a cylinder with two thicknesses, processed only by rotary cutting on a lathe. It is a structure, The thicker inner side of the two-stage cylindrical structure of the bearing housing is The outer diameter of the thicker The measurement is the outer diameter of the outer ring of the bearing + (4.0 mm or less), On the other hand, the narrower part of the two-stage cylindrical structure of the bearing housing is It is either a crimped or threaded type that penetrates the ring and is attached. The bearing housing according to claim 1 is fixed by a nut, thereby simplifying the shape of the bearing housing. A method for manufacturing the bearing device of the above-mentioned gyro.

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