WO2014181374A1 - 可撓性外歯歯車、波動歯車装置、および可撓性外歯歯車の締結方法 - Google Patents
可撓性外歯歯車、波動歯車装置、および可撓性外歯歯車の締結方法 Download PDFInfo
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- WO2014181374A1 WO2014181374A1 PCT/JP2013/002966 JP2013002966W WO2014181374A1 WO 2014181374 A1 WO2014181374 A1 WO 2014181374A1 JP 2013002966 W JP2013002966 W JP 2013002966W WO 2014181374 A1 WO2014181374 A1 WO 2014181374A1
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- WIPO (PCT)
- Prior art keywords
- fastening surface
- boss
- side fastening
- external gear
- flexible external
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H49/00—Other gearings
- F16H49/001—Wave gearings, e.g. harmonic drive transmissions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
- F16D1/076—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end by clamping together two faces perpendicular to the axis of rotation, e.g. with bolted flanges
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/08—Profiling
- F16H55/0833—Flexible toothed member, e.g. harmonic drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/17—Toothed wheels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/0018—Shaft assemblies for gearings
- F16H57/0025—Shaft assemblies for gearings with gearing elements rigidly connected to a shaft, e.g. securing gears or pulleys by specially adapted splines, keys or methods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H49/00—Other gearings
- F16H49/001—Wave gearings, e.g. harmonic drive transmissions
- F16H2049/003—Features of the flexsplines therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49462—Gear making
- Y10T29/49465—Gear mounting
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19642—Directly cooperating gears
- Y10T74/19647—Parallel axes or shafts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/1987—Rotary bodies
Definitions
- the present invention relates to a flexible external gear of a wave gear device capable of reliably fastening a member to be fastened, a wave gear device provided with the flexible external gear, and fastens the flexible external gear.
- the present invention relates to a fastening method for fastening to a target member.
- FIG. 1 of Patent Document 1 describes a structure in which a flexible external gear is fastened to the side of an output shaft by a fastening bolt.
- Patent Document 2 proposes a friction sheet used in such a fastening and fixing method.
- the friction sheet is obtained by plating and coating a surface of a metal elastic sheet with diamond particles capable of biting into a fastening surface of a member to be fastened.
- a driving pin is used in combination to increase the fastening force between the flexible external gear and the output shaft of the wave gear device to perform large torque transmission. Further, it is conceivable to use the friction sheet disclosed in Patent Document 2 in combination.
- Another object of the present invention is to propose a wave gear device provided with this new flexible external gear.
- the object of the present invention is to provide a method of fastening a flexible external gear that can perform necessary torque transmission only by bolt axial force without requiring pin hole processing and without using a friction sheet. It is to propose.
- the flexible external gear of the wave gear device of the present invention is An annular or disk-like boss fastened to a member to be fastened; A boss side fastening surface formed in the boss and in contact with a member side fastening surface formed in the member to be fastened; A plurality of engagement protrusions of a predetermined size formed at a predetermined pitch on the boss side fastening surface;
- the engagement protrusion is a protrusion integrally formed by performing a photoetching process on the boss side fastening surface,
- the hardness of the boss side fastening surface and the engagement projection is characterized by being HRC 45 or more.
- the typical engagement projection is a tapered projection that projects vertically from the boss side fastening surface, and the tip of the engagement projection is a flat top surface parallel to the boss side fastening surface.
- the cross-sectional shape of the engaging projection orthogonal to the direction of protrusion is circular, square or triangular.
- the pitch of the engaging projections disposed adjacent to each other is 0.2 mm to 0.5 mm, and the maximum diameter or maximum width of the top surface of the engaging projections is 0.01 mm to 0.05 mm,
- the height of the projection is preferably 1.0 to 1.2 times the maximum diameter or width of the top surface of the projection.
- the biting depth of the engagement protrusion with respect to the member side fastening surface is 0.015 mm to 0.025 mm It is desirable to
- the engaging projections be disposed at a density of 40 to 250 per 10 mm 2 .
- the boss side fastening surface of the flexible external gear is coaxially overlapped with the member-side fastening surface of the member to be fastened.
- the boss and the member to be fastened are fastened by the fastening bolt, and the engagement projection on the boss side fastening surface is made to the member to be fastened by the bolt axial force of the fastening bolt. It is made to bite to a predetermined bite depth from the side fastening surface.
- the engagement protrusion bites into the member side fastening surface, a large frictional force is generated between the fastening surfaces.
- the friction between the boss and the member to be fastened The coefficient can be increased. As a result, it is possible to perform the required torque transmission from the flexible external gear to the member to be fastened with only the fastening bolt without using the pin and the friction sheet in combination.
- the engagement projection is integrally formed on the boss side fastening surface by photo etching, the engagement projection drops out of the boss side fastening surface and intrudes into the rotational sliding portion and the engagement portion of the wave gear device, etc. Can prevent or suppress the harmful effects of
- the hardness of the member on which the engagement projection is formed may be equal to or higher than the hardness of the other member. It is also possible to form an engagement projection on both the boss side fastening surface and the member side fastening surface. In this case, the hardness of both members may be made equal.
- a member side fastening surface is formed on a member to be fastened
- a boss side fastening surface is formed on a boss provided on the flexible external gear to fasten the member to be fastened.
- the fastening surface of at least one of the member-side fastening surface and the boss-side fastening surface is a projection-side fastening surface
- On the protrusion side fastening surface a plurality of engagement protrusions of a predetermined size at a predetermined pitch are integrally formed by photo etching,
- the hardness of the projection side fastening surface is set to be the same as or higher than the hardness of the other of the fastening surfaces
- the boss side fastening surface of the flexible external gear is coaxially superimposed on the member side fastening surface of the member to be fastened; Fastening the boss and the member to be fastened using a fastening bolt, It is characterized in that the engaging projection of the projection side fastening surface is made to bite to a predetermined biting depth from the other fastening surface by a bolt axial force by the fastening bolt.
- FIG. 1 It is a perspective view of a cup type wave gear reduction gear to which the present invention is applied. It is a longitudinal cross-sectional view of a wave gear drive. It is a longitudinal cross-sectional view which shows the fastening part of the boss
- (A) is a partial expanded sectional view which shows another example of the protrusion for engagement
- (b) is a partial expanded sectional view
- (c) is a partial expanded sectional view.
- (A) is a partial expanded sectional view which shows another example of the protrusion for engagement
- (b) is a partial expanded sectional view
- (c) is a partial expanded sectional view.
- (A) is explanatory drawing which shows the state at the time of pushing conical protrusion into the steel-materials surface
- (b) is explanatory drawing which shows the state when the protrusion for engagement bites into a boss
- FIG. 1 is a perspective view showing a wave gear device
- FIG. 2 is a longitudinal sectional view thereof.
- the wave gear device 1 bends the ring-shaped rigid internal gear 2, the cup-shaped flexible external gear 3 capable of meshing with the rigid internal gear 2, and the flexible external gear 3 in an elliptical shape.
- an elliptical contour wave generator 4 partially meshed with the rigid internal gear 2.
- the cup-shaped flexible external gear 3 is continuous with the radially deformable cylindrical body 5, the annular diaphragm 6 extending inward from the rear end edge, and the inner peripheral edge of the diaphragm 6. It has an annular boss 7 formed and an external tooth 8 formed on the outer peripheral surface of the cylindrical barrel 5 on the open end side.
- the top hat-shaped flexible external gear has a cylindrical body which can be bent in the radial direction, an annular diaphragm extending radially outward from the rear end edge, and an outer peripheral edge of the diaphragm. And an outer tooth formed on the outer peripheral surface portion of the open end side of the cylindrical body portion.
- the wave generator 4 is fitted inside the portion of the cylindrical body 5 in which the external teeth 8 of the flexible external gear 3 are formed.
- the cylindrical body portion 5 is bent in an elliptical shape by the wave generator 4, and portions of the external teeth 8 located at both ends in the major axis direction of the elliptical shape mesh with the internal teeth 9 of the rigid internal gear 2. There is.
- the wave generator 4 has a rotary input shaft (not shown) such as a motor shaft connected and fixed, and is rotationally driven by the rotary input shaft.
- a rotary input shaft such as a motor shaft connected and fixed, and is rotationally driven by the rotary input shaft.
- the meshing position of the gears 2 and 3 moves in the circumferential direction.
- relative rotation occurs between the two gears according to the difference in the number of teeth of the two gears.
- the rigid internal gear 2 is fixed to a fixed member (not shown), and the flexible external gear 3 is a decelerating rotation output element. The decelerated rotation of the flexible external gear 3 is output to the load-side member (member to be fastened).
- FIG. 3 is a longitudinal sectional view showing the fastening portion of the flexible external gear 3 and the output member to be fastened
- FIG. 4 is an explanatory view showing the components thereof in an exploded manner.
- the output member 11 on the load side is fastened and fixed to the annular boss 7 of the flexible external gear 3.
- An annular mounting flange 12 and a plurality of fastening bolts 13 are used for fastening and fixing.
- a large diameter member side flange 14 is formed at the rear end portion of the output member 11, and the circular rear end face of the member side flange 14 is a member side fastening surface 15 orthogonal to the central axis.
- the member side fastening surface 15 is coaxially overlapped with the boss side fastening surface 16 which is the outer end surface of the boss 7.
- the boss side fastening surface 16 is an end face orthogonal to the device axis 1a.
- a mounting flange 12 is coaxially stacked on the inner end surface of the boss 7.
- Bolt holes are formed in the member-side flange 14 at regular intervals in the circumferential direction, and bolt insertion holes are similarly formed in the circumferential direction at regular intervals in the boss 7 and the mounting flange 12.
- the three members are coaxially stacked in a state where these bolt holes and bolt insertion holes coincide, and these three members are fastened and fixed with a predetermined bolt axial force by the fastening bolts 13 inserted from the side of the mounting flange 12 .
- 5 (a) to 5 (c) are a partially enlarged plan view showing the surface of the boss side fastening surface 16 in an enlarged manner, a partially enlarged sectional view in the case of cutting along the bb line, and a cutting taken along the cc line It is a partial expanded sectional view of a case.
- an engagement projection 20 of a predetermined shape is integrally formed at a predetermined pitch by photo etching.
- the engagement projections 20 are arranged in a matrix at a constant pitch, and the pitches Px and Py of the adjacent engagement projections are both within the range of 0.2 mm to 0.5 mm.
- the arrangement form of the engagement projections 20 may be an arrangement form other than the matrix form.
- Each of the engagement protrusions 20 is a tapered protrusion that protrudes vertically from the boss side fastening surface 16.
- the tip of the engagement projection 20 is a flat top surface parallel to the boss side fastening surface 16.
- the cross-sectional shape orthogonal to the protrusion direction in the protrusion 20 for engagement is circular. That is, in the present example, the engagement projection 20 is a projection that is generally shaped like a truncated cone, and its central axis 20 a is perpendicular to the boss side fastening surface 16.
- the outer peripheral surface 20b of the engagement projection 20 is formed of a curved surface that tapers toward the tip.
- the top surface 20c of the engagement projection 20 is a flat circular surface orthogonal to the central axis 20a.
- the maximum diameter L of the top surface 20c of the engagement projection 20 is a value within the range of 0.01 mm to 0.05 mm.
- the height H of the engagement projection 20 is a value within the range of 1.0 times to 1.2 times the maximum diameter L of the top surface 20c. Therefore, the height H is 0.06 mm or less.
- the engaging projections 20 are formed with a density that is within the range of 40 to 250 per 10 mm 2 .
- the diameter L of the top surface 20c of the engagement protrusion 20 is 0.05 mm
- the height H is 0.065 mm
- the pitches Px and Py are both 0.2 mm.
- the hardness of the surface portion of the boss side fastening surface 16 and the engaging projection 20 is HRC 45 or more. What has a hardness of HRC 45 or more may be used as the blank of the flexible external gear 3. Alternatively, when the hardness of the blank is less than HRC 45, the boss side fastening surface 16 is heat-treated, carburized, nitrided, etc. at the stage before or after the formation of the engagement projection 20 by photoetching. The hardness of the surface portion of the boss side fastening surface 16 and the engaging projection 20 may be made to be HRC 45 or more.
- the material hardness of the flexible external gear 3 is generally between HRC 36 and 45, and the material hardness of the output member 11 is also the same. It is desirable that the hardness of the boss side fastening surface 16 and the engaging projection 20 be equal to or higher than the hardness of the fastening side member side fastening surface 15.
- the formation of the engagement protrusions 20 can be performed by a general photoetching process.
- the photoresist film 31 is formed so as to cover the outer end face 16A of the boss 7 (FIG. 6 (a), (B).
- the photoresist film 31 is exposed and developed to form a masking pattern on the photoresist film (FIG. 6C).
- wet etching is performed on the exposed surface portion of the outer end face 16A to form the engagement projection 20 (FIG. 6D).
- the masking pattern of the photoresist film 31 is peeled and removed, and post-treatments such as cleaning and drying are performed (FIG.
- the substantially frusto-conical engagement projection 20 is integrally formed on the boss side fastening surface 16.
- engaging projections in the shape of a quadrangular frustum or triangular frustum are formed.
- FIG. 7 and 8 show another shape of the engagement projection 20.
- FIG. The engagement projection 20A shown in FIG. 7 has a substantially square frustum shape as a whole.
- the top surface of the engagement projection 20A is a square, and the width L is 0.05 mm, the height H is 0.06 mm, and the pitch P is 0.2 mm.
- the engaging projection 20B shown in FIG. 8 has a substantially triangular frustum shape as a whole.
- the top surface of the engagement protrusion 20B is an equilateral triangle, and the width L of the equilateral triangle is 0.06 mm.
- the height H of the engagement projection 20B is 0.06 mm, and the pitch P is 0.2 mm.
- the direction of the triangle is reversed every other one.
- the boss side fastening surface 16 is coaxially superimposed on the member side fastening surface 15 to be fastened.
- the mounting flange 12 is superimposed on the opposite side of.
- the fastening bolt 13 is inserted from the side of the mounting flange 12, and the three members of the output member 11, the boss 7 and the mounting flange 12 are fastened and fixed. Due to the bolt axial force of the fastening bolt 13, the engaging projection 20 of the boss side fastening surface 16 bites from the member side fastening surface 15 to be fastened to a predetermined bite depth. When the engagement projection 20 bites into the member-side fastening surface 15, a large frictional force is generated between the fastening surfaces.
- FIG. 9 (b) shows the case where the truncated cone-shaped engaging projection 20 of this example is inserted into the member-side fastening surface 15.
- the transmission torque of the fastening portion is greatly influenced by the coefficient of friction of the fastening surface when the engaging projection 20 is made to bite into the member-side fastening surface 15.
- the coefficient of friction can be defined by the bite projected area AT and the indentation area AR as described above. That is, the coefficient of friction is mainly determined by the shape and size of the engagement projection 20, the biting depth, and the hardness difference between the boss side fastening surface 16 and the member side fastening surface 15.
- a fastening surface having a target coefficient of friction In the present example, a truncated conical engagement protrusion 20 is formed by photo etching. A large friction coefficient can be obtained by setting the size L, height H, and hardness of the top surface of the engagement projection 20 having such a shape as described above.
- the number of protrusions n is limited by the shear strength of the material according to the total indentation area (AR ⁇ n).
- the number n of projections is set to a value within the range of 40 to 250 per 10 mm 2 .
- the biting depth x of the engagement protrusion differs depending on the shape of the top surface of the protrusion. If the shape of the top surface of the engagement projection is circular, square or triangular, the other case is the same condition, the triangular case is the most easy to bite, and the circular case is the most difficult to bite. Moreover, the biting depth x becomes larger in the fastening surface having a lower hardness than in the fastening surface having a high hardness. Furthermore, the biting depth x of the engagement protrusion differs depending on the area of the top surface of the engagement protrusion, and the smaller the area, the more easily bite.
- the arrangement pitch and the number per unit area, and the hardness of each part may be set appropriately.
- FIG. 10 is a graph showing an example of the relationship between the penetration depth (push-in depth) and the approximate friction coefficient when the diameter of the circular top surface is changed in the case of the frusto-conical engagement projection 20.
- the engagement projections 20 are arranged in a matrix, and the pitch P of the adjacently arranged engagement projections 20 is 0.2 mm to 0.5 mm, and the maximum diameter L of the top surface of the engagement projections 20 is 0.03 mm, 0. 0.2 mm.
- Three types of 04 mm and 0.05 mm were used, and the height of the engagement projection 20 was 1.0 times to 1.2 times the maximum diameter L of the top surface of the projection.
- the approximate friction coefficient is 0.35 or more if the biting depth is 0.01 mm to 0.025 mm. it can.
- the maximum diameter L of the top surface is 0.04 mm
- the approximate friction coefficient can be 0.35 or more by setting the biting depth to 0.015 mm to 0.035 mm.
- the maximum diameter L of the top surface is 0.05 mm
- the approximate friction coefficient can be 0.35 or more by setting the biting depth to 0.020 mm to 0.040 mm.
- the approximate friction coefficient can be set to about 0.35 or more by setting the biting depth to about 0.015 mm to 0.025 mm.
- the fastening method of the flexible external gear according to the present invention it is possible to form an engagement projection on the member-side fastening surface of the member to be fastened.
- the hardness of the member on which the engagement projection is formed may be equal to or higher than the hardness of the other member. It is also possible to form an engagement projection on both the boss side fastening surface and the member side fastening surface. In this case, the hardness of both members may be made equal.
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Abstract
Description
締結対象の部材に締結される円環状あるいは円盤状のボスと、
前記ボスに形成され、前記締結対象の部材に形成した部材側締結面に当接するボス側締結面と、
前記ボス側締結面に所定ピッチで形成された所定サイズの複数の係合用突起と、
を有し、
前記係合用突起は、前記ボス側締結面にフォトエッチング加工を施すことにより、一体形成された突起であり、
前記ボス側締結面および前記係合用突起の硬度はHRC45以上であることを特徴としている。
締結対象の部材には部材側締結面が形成され、
前記締結対象の部材を締結するために前記可撓性外歯歯車に設けたボスには、ボス側締結面が形成され、
前記部材側締結面および前記ボス側締結面のうちの少なくとも一方の締結面は突起側締結面であり、
当該突起側締結面には、所定ピッチで所定サイズの複数の係合用突起が、フォトエッチング加工により、一体形成され、
前記突起側締結面の硬度は、他方の前記締結面の硬度と同一あるいはそれ以上の硬度とされており、
前記可撓性外歯歯車の前記ボス側締結面を、前記締結対象の部材の前記部材側締結面に同軸に重ね合わせ、
締結ボルトを用いて前記ボスと前記締結対象の部材を締結し、
前記締結ボルトによるボルト軸力によって、前記突起側締結面の前記係合用突起を、他方の前記締結面から所定の食い込み深さまで食い込ませることを特徴としている。
図1は波動歯車装置を示す斜視図であり、図2はその縦断面図である。波動歯車装置1は、円環状の剛性内歯歯車2と、剛性内歯歯車2にかみ合い可能なカップ形状の可撓性外歯歯車3と、可撓性外歯歯車3を楕円状に撓めて剛性内歯歯車2に対して部分的にかみ合わせている楕円形輪郭の波動発生器4とを備えている。
At=n・r・d=n・r・r・cotθ=n・r2・(1/tanθ)
但し、r:円錐突起による圧痕の平均半径
θ:円錐突起の半頂角
d:深さ
円錐突起による圧痕面積≒真実接触面積Ar=P/Pm=n・πr2
P:全荷重
Pm:真実接触面積の平均面圧
摩擦係数μ=F/P=At・Pm/Ar・Pm=At/Ar
=1/(π・tanθ)
円錐突起のθが45degの場合には、μ=0.3183になる。
食い込み深さx≒d
食い込み投影面積AT≒At
圧痕面積AR≒Ar
近似摩擦係数Μ=AT/AR
なお、本発明の可撓性外歯歯車の締結方法では、締結対象の部材の部材側締結面に、係合用突起を形成しておくことも可能である。この場合には、係合用突起が形成されている部材の硬度を他方の部材の硬度以上としておけばよい。また、ボス側締結面および部材側締結面の双方に係合用突起を形成しておくことも可能である。この場合には、双方の部材の硬度を同程度としておけばよい。
Claims (10)
- 締結対象の部材に締結されるボスと、
前記ボスに形成され、前記締結対象の部材の部材側締結面に当接するボス側締結面と、
前記ボス側締結面に所定ピッチで形成された所定サイズの複数の係合用突起と、
を有し、
前記係合用突起は、前記ボス側締結面にフォトエッチング加工を施すことにより、一体形成された突起であり、
前記ボス側締結面および前記係合用突起の硬度はHRC45以上であることを特徴とする波動歯車装置の可撓性外歯歯車。 - 前記係合用突起は、前記ボス側締結面から垂直に突出している先細り形状の突起であり、
前記係合用突起の先端は、前記ボス側締結面に平行な平坦な頂面となっており、
前記係合用突起における、その突出方向に直交する断面形状は、円形、四角形あるいは三角形である請求項1に記載の波動歯車装置の可撓性外歯歯車。 - 隣接配置された前記係合用突起のピッチは0.2mm~0.5mmであり、
前記係合用突起の頂面の最大径あるいは最大幅は0.01mm~0.05mmであり、
前記係合用突起の高さは、前記突起の頂面の最大径あるいは最大幅の1.0倍から1.2倍である請求項2に記載の波動歯車装置の可撓性外歯歯車。 - 前記係合用突起は、10mm2当り40~250個の密度で配置されている請求項3に記載の波動歯車装置の可撓性外歯歯車。
- 剛性内歯歯車と、
前記剛性内歯歯車にかみ合い可能な可撓性外歯歯車と、
前記可撓性外歯歯車を楕円状に撓めて前記剛性内歯歯車に対して部分的にかみ合わせており、回転に伴って両歯車のかみ合い位置を周方向に移動させる波動発生器と、
を有し、
前記可撓性外歯歯車は、請求項1ないし4のうちのいずれか一つの項に記載の可撓性外歯歯車であることを特徴とする波動歯車装置。 - 波動歯車装置の可撓性外歯歯車を締結対象の部材に締結する可撓性外歯歯車の締結方法であって、
請求項1ないし4のうちのいずれか一つの項に記載の前記可撓性外歯歯車の前記ボス側締結面を、前記締結対象の部材の部材側締結面に同軸に重ね合わせ、
締結ボルトを用いて前記ボスと前記締結対象の部材を締結し、
前記締結ボルトのボルト軸力によって、前記ボス側締結面の前記係合用突起を、前記締結対象の部材に対して前記部材側締結面から所定の食い込み深さまで食い込ませることを特徴とする可撓性外歯歯車の締結方法。 - 波動歯車装置の可撓性外歯歯車を締結対象の部材に締結する可撓性外歯歯車の締結方法であって、
前記締結対象の部材には部材側締結面が形成され、
前記締結対象の部材を締結するために前記可撓性外歯歯車に設けたボスには、ボス側締結面が形成され、
前記部材側締結面および前記ボス側締結面のうちの少なくとも一方の締結面は突起側締結面であり、
当該突起側締結面には、所定ピッチで所定サイズの複数の係合用突起が、フォトエッチング加工により、一体形成され、
前記突起側締結面の硬度は、他方の前記締結面の硬度と同一あるいはそれ以上の硬度であり、
前記可撓性外歯歯車の前記ボス側締結面を、前記締結対象の部材の前記部材側締結面に同軸に重ね合わせ、
締結ボルトを用いて前記ボスと前記締結対象の部材を締結し、
前記締結ボルトによるボルト軸力によって、前記突起側締結面の前記係合用突起を、他方の前記締結面から所定の食い込み深さまで食い込ませることを特徴とする可撓性外歯歯車の締結方法。 - 前記係合用突起は、前記突起側締結面から垂直に突出している先細り形状の突起であり、
前記係合用突起の先端は、前記突起側締結面に平行な平坦な頂面となっており、
前記係合用突起における、その突出方向に直交する断面形状は、円形、四角形あるいは三角形である請求項7に記載の可撓性外歯歯車の締結方法。 - 隣接配置された前記係合用突起のピッチは0.2mm~0.5mmであり、
前記係合用突起の頂面の最大径あるいは最大幅は0.01mm~0.05mmであり、
前記係合用突起の高さは、前記突起の頂面の最大径あるいは最大幅の1.0倍から1.2倍である請求項8に記載の可撓性外歯歯車の締結方法。 - 前記係合用突起は、10mm2当り40~250個の密度で配置されている請求項9に記載の可撓性外歯歯車の締結方法。
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US14/371,446 US9394985B2 (en) | 2013-05-08 | 2013-05-08 | Flexible externally toothed gear, strain wave gearing, and method for fastening flexible externally toothed gear |
KR1020147023390A KR101542488B1 (ko) | 2013-05-08 | 2013-05-08 | 가요성 외치 기어, 파동 기어 장치, 및 가요성 외치 기어의 체결 방법 |
CN201380015234.7A CN104285075B (zh) | 2013-05-08 | 2013-05-08 | 挠性外齿齿轮、波动齿轮装置及挠性外齿齿轮的接合方法 |
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JP2014530454A JP5885848B2 (ja) | 2013-05-08 | 2013-05-08 | 可撓性外歯歯車の製造方法、波動歯車装置の製造方法および可撓性外歯歯車の締結方法 |
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EP3228902A4 (en) * | 2014-12-05 | 2018-12-26 | Harmonic Drive Systems Inc. | Fastenting structure for flexible external gear and shaft member in strain wave gearing device |
CN114110136A (zh) * | 2021-11-30 | 2022-03-01 | 重庆大学 | 复波式活齿减速器内齿廓设计方法及两级减速器 |
WO2023026432A1 (ja) * | 2021-08-26 | 2023-03-02 | ファナック株式会社 | 回転力を伝達するロボットの動力伝達機構およびロボットの駆動装置 |
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WO2016129123A1 (ja) * | 2015-02-13 | 2016-08-18 | 株式会社ハーモニック・ドライブ・システムズ | 波動歯車装置および波動発生器 |
JP6530873B1 (ja) | 2019-02-01 | 2019-06-12 | 株式会社不二機販 | 波動歯車減速機用歯車の表面処理方法 |
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US20150240929A1 (en) | 2015-08-27 |
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