JP2017036797A - Output shaft, speed reducer, and motor with the speed reducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new output shaft materializing required strength.SOLUTION: An output shaft 13 is equipped with a shaft member 40; and an output member fixed to the shaft member. The shaft member 40 has a serration portion 41 made from crest portions 41a and trough portions alternately arranged in a circumferential direction and extended in an axial direction; and a plurality of first projecting portions 40d annularly formed at intervals on an annular first end surface intersecting the axial direction. The output member has a plurality of grooves 42d extended in the axial direction so as to engage with the serration portion 41, and a plurality of second recessed portions annularly formed at intervals on a second end surface opposite to the first end surface, and formed so as to engage with the plurality of projecting portions 40d.SELECTED DRAWING: Figure 15

Description

  The present invention relates to an output shaft used for a reduction gear.

  Conventionally, a motor with a reduction gear used for a power window device of a vehicle such as an automobile is known. As such a motor with a speed reducer, for example, a motor including a motor body that rotationally drives a rotating shaft and a speed reducing unit as a rotation transmission device having a worm gear that decelerates the rotation of the rotating shaft is known. And as such a deceleration part, there exists what connected the worm wheel to the output shaft via the buffer mechanism (refer patent document 1).

  In addition, an output shaft has been devised in which a gear portion is formed at one end of the shaft portion. And the gear part of an output shaft is meshed | engaged with the gear part of a regulator, and it connects with a vehicle window via a regulator (refer patent document 2).

Japanese Patent No. 5562131 Japanese Patent No. 5134985

  As the above-described output shaft, a shaft portion and a gear portion which are integrally formed and processed, or a shaft portion and a gear portion which are separate parts and assembled can be considered.

  However, if the shape of the output shaft is complicated, it is difficult to integrally form and process the shaft portion and the gear portion, and the process becomes complicated, resulting in an increase in manufacturing cost. On the other hand, when the shaft part and the gear part are separate parts and they are assembled to produce an output shaft, if an excessive force is applied to the gear part, the fitting part between the gear part and the shaft part may be deformed. Yes, there is room for improvement.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a novel output shaft that realizes a desired strength.

  In order to solve the above problems, an output shaft according to an aspect of the present invention is an output shaft used in a reduction gear, and includes a shaft member and an output member fixed to the shaft member. The shaft member is formed in a ring shape with an interval between serration portions composed of peaks and valleys alternately arranged in the circumferential direction and extending in the axial direction, and an annular first end face intersecting the axial direction. First protrusions or a plurality of first recesses. The output member is formed in an annular shape with a plurality of grooves extending in the axial direction so as to engage with the serration portion and a second end surface opposed to the first end surface, and the plurality of first protrusions or the plurality A plurality of second concave portions or a plurality of second convex portions formed to engage with the first concave portion.

  According to this aspect, not only the engagement between the serration portion of the shaft member and the groove of the output member, but also the plurality of first convex portions or the plurality of first concave portions formed in an annular shape on the first end surface of the shaft member, and the output Since the plurality of second concave portions or the plurality of second convex portions formed annularly on the second end surface of the member engage with each other, the torsional strength of the output shaft in which the output member and the shaft member are integrated is improved. .

  The shaft member may include a first portion and a second portion that is continuous with the first portion. The output member is fixed to the first part, the serration part is formed on the outer periphery of the first part, and the first end surface is a step between the first part and the second part, The member has a hole formed in the center of the output member, into which the first portion enters, a plurality of teeth formed on the outer peripheral portion, and a plurality of grooves formed on the inner periphery of the hole. Also good.

  Alternatively, the shaft member may have a first portion and a second portion that is continuous with the first portion. The output member is fixed to the first portion, the serration portion is formed on the inner peripheral portion of the first portion, the first end surface is a surface in contact with the output member of the first portion, and the output member is And an entry portion that is formed at the center of the output member and enters the first portion, and a plurality of grooves that are formed on the outer periphery of the entry portion.

  The output member may have a groove formed between the center of the hole and the tooth. Thereby, the change of the radial thickness of the output member due to the formation of the groove can be reduced.

  The shaft member may have a plurality of first protrusions. The output member may have a plurality of second recesses. The output member may have a second recess formed between the center of the hole and the tooth. Thereby, since a 2nd recessed part can be formed in the area | region where there is much thickness of a gear member, the strength fall by recessed part formation can be reduced.

  The shaft member may have a peak portion of the serration portion between the axial center of the first portion and the first convex portion.

  The output member may have a second convex portion formed between the center of the hole and the bottom of the tooth between the teeth. Thereby, since a 2nd convex part can be formed in the area | region where there is little flesh of an output member, the intensity | strength near a tooth root can be improved.

  The first portion may have a locking portion in which a tip portion protruding from the hole of the output member is deformed. As a result, the shaft member can be prevented from falling off from the output member.

  The shaft member and the output member may be made of sintered metal. Thereby, a high intensity | strength output shaft can be manufactured with a type | mold. Further, the use of sintered metal of a grade suitable for each of the shaft member and the output member increases the degree of freedom in manufacturing and enables cost reduction.

  The output member may be carburized and quenched. Thereby, the intensity | strength of the tooth | gear which requires big force can further be improved.

  In the serration unit, the number of crests may be an integer multiple of the number of teeth. Thereby, the stress which acts on the output member which comprises an output shaft can be relieved.

  Another aspect of the present invention is also an output shaft. This output shaft is an output shaft used for a reduction gear, and is fixed to a shaft member having a first portion and a second portion continuous to the first portion, and a first portion of the shaft member. An output member. The output member has a hole formed at the center of the output member through which the first portion enters and the tip of the first portion protrudes. The shaft member is fixed to the output member with the tip of the first portion protruding from the hole of the output member, and the region near the boundary between the first portion and the second portion is fixed to the output member. Yes.

  According to this aspect, even if the first portion of the shaft member is not press-fitted over the entire hole of the output member, the shaft member and the output member are fixed to each other at least in two places, so that the shaft member is output. It can be prevented from falling off the member.

  The shaft member may be configured such that a clearance is formed between the tip of the first portion and a region in the vicinity of the boundary while being fixed to the output member. Thereby, the force required when assembling the shaft member and the output member can be suppressed, deformation and cracking of the components can be suppressed, and productivity can be improved.

  The shaft member may include a plurality of first protrusions or a plurality of first recesses formed in an annular shape with a gap in an annular first end surface that is a step between the first portion and the second portion. Good. The output member is formed in an annular shape with a spacing between the second end surface facing the first end surface and a plurality of second recesses formed to engage with the plurality of first protrusions or the plurality of first recesses, or You may have a some 2nd convex part. The plurality of first convex portions or the plurality of first concave portions and the plurality of second concave portions or the plurality of second convex portions may be press-fitted.

  Another aspect of the present invention is a speed reducer. The speed reducer includes a worm to which the rotation of the motor is transmitted, a worm wheel that meshes with the worm, an output shaft that meshes with the driven member and drives the driven member, and a transmission that transmits the rotation of the worm wheel to the output shaft. A mechanism and a housing for accommodating the worm wheel.

  According to this aspect, it is possible to provide a reduction gear having a high output shaft strength.

  Yet another embodiment of the present invention is a motor with a reduction gear. The motor with a speed reducer includes a motor and a speed reducer connected to the motor shaft.

  A motor with a reduction gear having high output shaft strength according to this aspect can be provided.

  It should be noted that any combination of the above-described constituent elements and a representation of the present invention converted between a method, an apparatus, a system, etc. are also effective as an aspect of the present invention.

  According to the present invention, a novel output shaft that achieves a desired strength can be realized.

It is a front view by the side of the output gear of the motor with a reduction gear which concerns on 1st Embodiment. It is a figure which shows schematic structure of the power window system which concerns on 1st Embodiment. It is a principal part enlarged view which shows the engagement state of the output shaft and driven member which concern on 1st Embodiment. 4A is a perspective view of the output shaft according to the first embodiment, and FIG. 4B is a view of the output shaft according to the first embodiment viewed from a direction different from that in FIG. It is a perspective view. It is a front view of the shaft member which constitutes the output shaft concerning a 1st embodiment. It is the bottom view which looked at the shaft member shown in FIG. 5 from X1 direction. FIG. 7 is an A-A ′ broken sectional view of the shaft member shown in FIG. 6. It is the top view which looked at the shaft member shown in FIG. 5 from the X2 direction. It is a principal part enlarged view of the BB cross section of the shaft member shown in FIG. It is a front view of the gear member which comprises the output shaft which concerns on 1st Embodiment. It is AOB sectional drawing of the gear member shown in FIG. It is a rear view of the gear member which comprises the output shaft which concerns on 1st Embodiment. It is a principal part enlarged view of CC cross section of the gear member shown in FIG. It is a top view of the output shaft concerning a 1st embodiment. It is AA sectional drawing of the output shaft shown in FIG. It is a schematic diagram for demonstrating engagement with the 1st convex part of a shaft member, and the 2nd recessed part of a gear member. It is a schematic diagram for demonstrating engagement with the 1st convex part and 2nd recessed part which concern on a modification. It is a front view of the gear member concerning a 2nd embodiment. It is an expansion perspective view near the hole of a gear member. It is a disassembled perspective view of the output shaft which concerns on 3rd Embodiment. FIG. 21 is an exploded perspective view of an output shaft according to a third embodiment viewed from a direction different from FIG. 20. It is a front view of the output plate which comprises the output shaft which concerns on 3rd Embodiment. It is DD sectional drawing of the output plate shown in FIG. It is a rear view of the output plate which comprises the output shaft which concerns on 3rd Embodiment. It is a principal part enlarged view of the EE cross section of the output plate shown in FIG. FIG. 26A is a schematic diagram of an output shaft according to the fourth embodiment, and FIG. 26B is a schematic diagram of an output shaft according to a modification of the fourth embodiment. It is a schematic diagram of the output shaft which concerns on 5th Embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. Moreover, the structure described below is an illustration and does not limit the scope of the present invention at all.

[First Embodiment]
(Motor with reduction gear)
The motor with a reduction gear according to the first embodiment is suitable for a power window system of a vehicle, for example. FIG. 1 is a front view of the output gear side of the motor with a reduction gear according to the first embodiment. The motor 100 with a speed reducer includes a motor unit 10 and a speed reducer 12 connected to the shaft of the motor unit 10.

  The speed reducer 12 includes a worm (not shown) to which the rotation of the motor is transmitted, a worm wheel (not shown) that meshes with the worm, an output shaft 13 that meshes with the driven member and drives the driven member, and the worm wheel A transmission mechanism (not shown) for transmitting the rotation of the worm wheel to the output shaft, and a gear box 14 as a housing for housing the worm wheel.

(Power window system)
FIG. 2 is a diagram showing a schematic configuration of the power window system according to the first embodiment. FIG. 3 is an enlarged view of a main part showing an engaged state between the output shaft and the driven member according to the first embodiment. As shown in FIG. 2, the vehicle power window system 200 includes a motor 100 with a reduction gear and an X-arm type regulator 110.

  The regulator 110 includes a metal support base 22 fixed to the inner panel 20 of the door 18, a lift arm 26 rotatably connected to the support base 22 via a support shaft 24, and the lift arm 26. Sector gear 28 coupled to each other, an equalizer arm 30 rotatably connected to the lift arm 26, an equalizer bracket 32 for guiding the movement of the lower end portion of the equalizer arm 30, and an upper end portion and an equalizer arm of the lift arm 26 The lift arm bracket 34 guides the movement of the upper end portion 30. A window glass 36 as an opening / closing body is attached to the lift arm bracket 34.

  As shown in FIG. 1, a plurality of cylindrical mounting portions 38 are integrally formed in the gear box 14, and the gear box 14 has a plurality of screw screws (not shown) penetrating the support base 22. It is fixed to the support base 22 by being fastened to 38. That is, the motor 100 with a speed reducer is fixed to the regulator 110 in the speed reducer 12, and the motor unit 10 side is separated from the regulator 110.

  4A is a perspective view of the output shaft according to the first embodiment, and FIG. 4B is a view of the output shaft according to the first embodiment viewed from a direction different from that in FIG. It is a perspective view.

  The output shaft 13 is used for the speed reducer 12 and is a combination of a plurality of members. Specifically, the output shaft 13 includes a shaft member 40 and a gear member 42 as an output member fixed to an end portion of the shaft member 40. As shown in FIG. 3, the motor 100 with a reduction gear and the regulator 110 are arranged so that the gear member 42 and the sector gear 28 are engaged with each other.

  Therefore, when the rotating shaft rotates by driving the motor unit 10, the driving force is transmitted to the output shaft 13 through the worm shaft and the worm wheel, and the output shaft 13 (gear member 42) rotates. When the rotation of the gear member 42 is transmitted to the sector gear 28 and the lift arm 26 rotates about the support shaft 24, the regulator 110 operates so that the lift arm bracket 34 moves up and down, and the window glass 36 is opened and closed. The

(Shaft member)
Next, details of the configuration of the shaft member of the output shaft will be described. FIG. 5 is a front view of a shaft member constituting the output shaft according to the first embodiment. FIG. 6 is a bottom view of the shaft member 40 shown in FIG. 5 viewed from the X1 direction. FIG. 7 is a cross-sectional view taken along line AA ′ of the shaft member 40 shown in FIG. FIG. 8 is a top view of the shaft member 40 shown in FIG. 5 as viewed from the X2 direction. FIG. 9 is an enlarged view of an essential part of the BB cross section of the shaft member 40 shown in FIG.

  The shaft member 40 according to the first embodiment includes a cylindrical small-diameter portion 40a that is a first portion and a cylindrical large-diameter portion 40b that is a second portion. The small diameter portion 40a and the large diameter portion 40b are continuous through a step. The small-diameter portion 40a and the large-diameter portion 40b may be prismatic or other shapes. The shaft member 40 is formed on the outer peripheral portion of the small-diameter portion 40a. The serration portion 41 includes a peak portion 41a and a valley portion 41b that are alternately arranged in the circumferential direction and extend in the axial direction, and the small-diameter portion 40a and the large-diameter portion. A plurality of first protrusions 40d formed in an annular shape with a gap in the annular first end surface 40c, which is a step (flange portion) between the portion 40b. Further, a C-type retaining ring groove 40e for fixing the other member and the shaft member 40 in a connected state is formed in the vicinity of the end of the large diameter portion 40b opposite to the small diameter portion 40a.

  The serration part 41 according to the first embodiment has eight peak parts 41a and eight valley parts 41b extending in the axial direction. Further, eight first convex portions 40d are provided at equal intervals (45 ° intervals) in the circumferential direction of the first end surface 40c. In the shaft member 40 according to the first embodiment, a peak 41a of the serration portion 41 is formed between the shaft center O of the small diameter portion 40a and the first convex portion 40d. Thereby, the symmetry of a shape increases and the intensity | strength of the whole shaft member with respect to external force increases.

  The shaft member 40 according to the first embodiment is preferably, for example, an Fe-based sintered alloy containing copper or nickel from the viewpoint of strength. Such a sintered alloy can be obtained by molding a powder compact at a high temperature and high pressure using a mold. The material characteristics required for the shaft member 40 should be suitable for cutting such as forming the groove 40e for the above-described C-type retaining ring in addition to obtaining a desired strength of the finished part. Of course, it is preferable to be suitable for molding a complicated shape by a mold.

(Gear member)
Next, details of the configuration of the gear member of the output shaft will be described. FIG. 10 is a front view of the gear member constituting the output shaft according to the first embodiment. FIG. 11 is a cross-sectional view of the gear member 42 shown in FIG. FIG. 12 is a rear view of the gear member constituting the output shaft according to the first embodiment. FIG. 13 is an enlarged view of a main part of the CC cross section of the gear member 42 shown in FIG.

  The gear member 42 according to the first embodiment includes a hole 42a formed in the center of the gear member, into which the small diameter portion 40a of the shaft member 40 enters, a plurality of teeth 42c formed in the outer peripheral portion 42b, and a hole A plurality of grooves 42d formed in the inner circumference of 42a and extending in the axial direction so as to engage with the serration portion 41 of the shaft member 40, and a second end surface 42e facing the first end surface 40c of the shaft member 40 A plurality of second recesses 42f formed in an annular shape at intervals and formed to engage with the plurality of first protrusions 40d.

  The gear member 42 is fixed to the small diameter portion 40a by inserting the small diameter portion 40a of the shaft member 40 into the central hole 42a. In the gear member 42, a groove 42d extending in the axial direction is formed between the center O of the hole 42a and the tooth 42c. The eight grooves 42d have a shape corresponding to the shape of the peak portion 41a of the serration portion 41 of the shaft member 40, and are provided at equal intervals (45 ° intervals) in the circumferential direction of the inner periphery of the hole 42a. Thereby, the change of the radial thickness of the gear member 42 due to the formation of the groove 42d can be reduced.

  The gear member 42 according to the first embodiment has eight second recesses 42f. The gear member 42 has a second recess 42f formed between the center of the hole 42a and the tooth 42c. Thereby, since the 2nd recessed part 42f can be formed in the area | region where the gear member 42 has many flesh, ie, the base of the tooth | gear 42c, the strength fall by recessed part formation can be reduced.

  In addition, the gear member 42 may form a plurality of second convex portions 42h (see FIG. 12) on the second end surface 42e instead of the second concave portions. In this case, the second convex portion 42h may be formed between the center O of the hole 42a and the tooth bottom 42j between the teeth 42c and the teeth 42c. Thereby, since the 2nd convex part 42h can be formed in the area | region of the tooth base vicinity with few flesh of the gear member 42, the intensity | strength of the tooth base vicinity can be improved.

  In addition, when the 2nd end surface 42e of the gear member 42 is provided with the some 2nd convex part 42h, the 1st end surface 40c of the corresponding shaft member 40 has several 1st convex parts 40d instead of several 1st convex parts 40d. A recess may be provided.

  The gear member 42 according to the first embodiment is preferably, for example, an Fe-based sintered alloy containing copper or nickel from the viewpoint of strength. Further, the gear member 42 is preferably subjected to carburizing and quenching in order to increase the strength because a large force is applied to the teeth 42c. In addition, quenching is necessary or unnecessary depending on the application and shape of the part. For example, one or both of the shaft member 40 and the gear member 42 may be quenched, and neither the shaft member 40 nor the gear member 42 may be quenched.

  Thus, the shaft member 40 and the gear member 42 are made of sintered metal, and an output shaft having high strength can be manufactured by using a mold. Further, by using the shaft member 40 and the gear member 42 as separate members, the use of sintered metals of suitable grades increases the degree of freedom in manufacturing and enables cost reduction.

(Output shaft)
Next, the details of the configuration of the output shaft 13 assembled with the shaft member 40 and the gear member 42 will be described. FIG. 14 is a top view of the output shaft 13 according to the first embodiment. 15 is a cross-sectional view of the output shaft 13 taken along line AA shown in FIG.

  The output shafts 13 are fixed to each other in a state where the small diameter portion 40a of the shaft member 40 is inserted into the hole 42a of the gear member 42. In the first embodiment, the small diameter portion 40a may have a locking portion 40f in which a tip portion protruding from the hole 42a of the gear member 42 is deformed. As a result, the shaft member 40 can be prevented from falling off the gear member 42. In addition, what is necessary is just to perform a deformation | transformation of a front-end | tip part by applying force and heat from the outside.

  In the output shaft according to the first embodiment, any of the number of peak portions 41a of the serration portion 41, the number of first convex portions 40d, the number of grooves 42d of the gear member 42, and the number of second concave portions 42f There are also eight. In addition, the number of the peak portions 41a of the serration portion 41, the number of the first convex portions 40d, the number of the grooves 42d of the gear member 42, and the number of the second concave portions 42f are N of the number of the other configurations. It is good that it is double (N is an integer) or 1 / N times (N is an integer). For example, the number of peak portions 41 a of the serration portion 41 may be an integral multiple of the number of teeth 42 c of the gear member 42. Further, the peak portion 41a of the serration portion 41, the first convex portion 40d, the groove 42d of the gear member 42, and the second concave portion 42f are linearly arranged in the radial direction. Or you may arrange | position radially.

  Thus, the strength of the output shaft 13 itself is improved by making the serration portion 41 and the first convex portion 40d of the shaft member 40 and the teeth 42c and the second concave portion 42f of the gear member 42 have a highly symmetrical shape and arrangement. In addition, the stress acting on the gear member 42 constituting the output shaft 13 can be relaxed.

  Further, the output shaft 13 is not only engaged with the crest 41a of the serration portion 41 of the shaft member 40 and the groove 42d of the gear member 42, but also with a plurality of annularly formed first ends 40c of the shaft member 40. Since one convex portion 40d and a plurality of second concave portions 42f formed in an annular shape on the second end surface 42e of the gear member 42 are engaged, the output shaft 13 in which the gear member 42 and the shaft member 40 are integrated. Improves torsional strength.

  That is, when there is a large input on the output shaft 13 by engaging two or more members in two or three dimensions in comparison with the case where there is only one place in one dimension. The force acting between the members is less likely to be intensively applied to one engaging portion, and deformation of the engaging portion can be suppressed. Therefore, by using such an output shaft, it is possible to provide a speed reducer and a motor with a speed reducer with high output shaft strength.

(Engagement of convex part and concave part)
FIG. 16 is a schematic diagram for explaining the engagement between the first convex portion 40 d of the shaft member 40 and the second concave portion 42 f of the gear member 42. FIG. 16 is a linear development of the first convex portion 40d and the second concave portion 42f arranged in an annular shape. From the state shown in FIG. 16, the first convex portion 40d and the second concave portion 42f are engaged by bringing the first end surface 40c and the second end surface 42e closer to or in contact with each other.

  FIG. 17 is a schematic diagram for explaining the engagement between the first convex portion and the second concave portion according to the modification. The 1st convex part 40g which concerns on a modification further has the projection part 40h in the center part of the top. When assembling the shaft member 40 and the gear member 42, when the second end face 42e and the first end face 40c are brought close to each other, the protrusion 40h is reliably crushed and deformed at the bottom of the second recess 42f, so that the first protrusion The portion 40g extends in the width direction (the circumferential direction of the first end face 40c). Thereby, the clearance gap between the 1st convex part 40g and the 2nd recessed part 42f at the time of engagement reduces, and a more reliable press-fit state can be maintained. Therefore, even if the output shaft 13 repeats normal rotation and reverse rotation, abnormal noise and vibration due to play are suppressed.

[Second Embodiment]
FIG. 18 is a front view of the gear member 44 according to the second embodiment. FIG. 19 is an enlarged perspective view of the vicinity of the hole of the gear member 44. In the gear member 42 according to the first embodiment, an annular continuous recess 42m is formed on the third end face 42k opposite to the second end face 42e (see FIGS. 10 and 11). In contrast, in the gear member 44 according to the second embodiment, a plurality of radial recesses 42n are further formed at the bottom of the annular continuous recess 42m. The recess 42n is formed from the inner periphery of the hole 42a toward the outer periphery in the radial direction. The recess 42n is formed from the center O of the hole 42a to a certain distance. A plurality of grooves 42d are formed on the inner periphery of the hole 42a, and the radius of the hole 42a is not constant, so the length of the recess 42n varies.

  As described above, the plurality of recesses 42n are formed in an annular shape with an interval from the third end face 42k. As a result, when the distal end portion of the small diameter portion 40a of the shaft member 40 is protruded from the hole 42a of the gear member 44 and is deformed by applying an external force to the distal end portion in this state, a part of the distal end portion becomes a plurality of concave portions 42n. Get in. As a result, the shaft member 40 and the gear member 44 are more firmly fixed, and it is possible to further suppress the occurrence of backlash in the rotational direction and backlash (axial direction) of the shaft member 40 with respect to the gear member 44.

[Third Embodiment]
Although the vehicle power window system according to the first embodiment is an X-arm regulator, the present invention can also be applied to a wire regulator. Below, the output shaft applied to a wire type regulator is demonstrated.

  FIG. 20 is an exploded perspective view of the output shaft according to the third embodiment. FIG. 21 is an exploded perspective view of the output shaft according to the third embodiment viewed from a direction different from FIG.

  The output shaft 46 is used for the speed reducer 12 and is a combination of a plurality of members. Specifically, the output shaft 46 includes a shaft member 40 and an output plate 48 as an output member fixed to the end of the shaft member 40. Since the shaft member 40 has substantially the same configuration as that of the first embodiment except that the number of grooves of the serration portion and the number of second recesses are different, the description thereof will be omitted as appropriate.

  FIG. 22 is a front view of the output plate 48 constituting the output shaft according to the third embodiment. FIG. 23 is a DD cross-sectional view of the output plate 48 shown in FIG. FIG. 24 is a rear view of the output plate 48 constituting the output shaft according to the third embodiment. FIG. 25 is an enlarged view of an essential part of the EE cross section of the output plate 48 shown in FIG.

  The output plate 48 according to the third embodiment is formed in a hole 48a into which the small diameter portion 40a of the shaft member 40 enters, and one disk-like end face 48b formed at the center of the disk-like member. Three engaging portions 48c, a plurality of grooves 48d extending in the axial direction so as to engage with the serration portion 41 of the shaft member 40, formed on the inner periphery of the hole 48a, and the first of the shaft member 40 The other end surface 48e facing the end surface 40c is annularly formed at intervals, and has a plurality of second recesses 48f formed to engage with the plurality of first protrusions 40d.

  The output plate 48 is fixed to the small diameter portion 40a by inserting the small diameter portion 40a of the shaft member 40 into the central hole 48a. The nine grooves 48d have a shape corresponding to the shape of the peak portion 41a of the serration portion 41 of the shaft member 40, and are provided at equal intervals (40 ° intervals) in the circumferential direction of the inner periphery of the hole 48a.

  The output plate 48 according to the third embodiment has nine second recesses 48f. The output plate 48 may be formed with a plurality of second convex portions on the other end surface 48e instead of the second concave portion. When a plurality of second convex portions are provided on the other end surface 48e of the output plate 48, a plurality of first concave portions are provided on the first end surface 40c of the corresponding shaft member 40 instead of the plurality of first convex portions 40d. Good.

[Fourth Embodiment]
FIG. 26A is a schematic diagram of an output shaft according to the fourth embodiment, and FIG. 26B is a schematic diagram of an output shaft according to a modification of the fourth embodiment.

  The output shaft 50 shown in FIG. 26A includes a cylindrical shaft member 52 and a disk-shaped output member 54 fixed to the shaft member 52. The shaft member 52 has a concave hole 52a at the center. On the inner peripheral surface of the hole 52a, there is a gap between a serration portion 52b composed of peaks and valleys alternately arranged in the circumferential direction and extending in the axial direction, and an annular first end surface 52c intersecting the axial direction Ax. And a plurality of first convex portions 52d (or a plurality of first concave portions) formed in an annular shape.

  The output member 54 is the aforementioned gear member, output plate, or the like. The output member 54 is formed in an annular shape at intervals between a plurality of grooves 54a extending in the axial direction so as to engage with the serration portion 52b and a second end surface 54b facing the first end surface 52c. And a plurality of second recesses 54c (or a plurality of second protrusions) formed to engage with the first protrusions 52d (or the plurality of first recesses).

  Accordingly, not only the engagement between the serration portion 52b of the shaft member 52 and the groove 54a of the output member 54, but also a plurality of first convex portions 52d (or a plurality of the plurality of first protrusions 52d formed annularly on the first end surface 52c of the shaft member 52). The first recess) and the plurality of second recesses 54c (or the plurality of second projections) formed in an annular shape on the second end surface 54b of the output member 54 are engaged with each other. The torsional strength of the integrated output shaft 50 is improved.

  In other words, the output shaft 50 described above can be expressed as follows. The shaft member 52 includes a first portion 52e and a second portion 52f that is continuous with the first portion 52e. And the output member 54 is being fixed to the 1st part 52e, the serration part 52b is formed in the inner peripheral part of the hole 52a of the 1st part 52e, and the 1st end surface 52c is the 1st part 52e. It is a surface in contact with the output member 54. The output member 54 includes a columnar entry portion 54d that is formed at the center of the output member and enters the first portion 52e, and a plurality of grooves 54a that are formed on the outer periphery of the entry portion 54d. Yes.

  The output shaft 56 shown in FIG. 26B includes a cylindrical shaft member 58 and a disk-shaped output member 60 fixed to the shaft member 58. The shaft member 58 has a through hole 58a formed at the center. On the inner peripheral surface of the through-hole 58a, there are spaces between serrations 58b that are alternately arranged in the circumferential direction and extending in the axial direction, and annular first end surfaces 58c that intersect the axial direction Ax. And a plurality of first convex portions 58d (or a plurality of first concave portions) formed in an annular shape.

  The output member 60 is the above-described gear member, output plate, or the like. The output member 60 is annularly formed with a plurality of grooves 60a extending in the axial direction so as to engage with the serration portion 58b and the second end surface 60b facing the first end surface 58c. A plurality of second concave portions 60c (or a plurality of second convex portions) formed so as to engage with the first convex portions 58d (or the plurality of first concave portions).

  Thereby, like the output shaft 50, the torsional strength of the output shaft 56 in which the output member and the shaft member are integrated is improved.

  In other words, the output shaft 56 can be expressed as follows. In the shaft member 58, the first portion 58e and the second portion 58f are continuous without distinction. The output member 60 is fixed to the first portion 58e, the serration portion 58b is formed in the inner peripheral portion of the through hole 58a of the first portion 58e, and the first end surface 58c is the first portion 58e. This is a surface in contact with the output member 60. The output member 60 includes a columnar entry portion 60d that is formed at the center of the output member and enters the first portion 58e, and a plurality of grooves 60a that are formed on the outer periphery of the entry portion 60d. Yes. Further, the tip of the entry portion 60d is deformed by receiving an external force and functions as a locking portion. Thereby, it becomes more difficult for the output member 60 to come off from the shaft member 58.

[Fifth Embodiment]
FIG. 27 is a schematic diagram of an output shaft according to the fifth embodiment. 27 has a configuration similar to that of the output shaft 13 according to the first embodiment, but the shaft member 64 is not fastened (press-fitted) to the output member 66 via a serration portion. The point is different.

  The output shaft 62 includes: a shaft member 64 having a first portion 64a as a cylindrical small diameter portion and a second portion 64b as a cylindrical large diameter portion continuous to the first portion 64a; And an output member 66 fixed to the first portion 64a. The output member 66 has a through hole 66a formed in the center of the output member, into which the first portion 64a enters and from which the tip of the first portion protrudes. The shaft member 64 is fixed to the output member 66 by deforming the tip in a state where the tip of the first portion 64a protrudes from the through hole 66a of the output member 66 (region R1), and the first member 64a A region R2 in the vicinity of the boundary with the second portion 64b is fixed to the output member 66.

  Thereby, even if the first portion 64a of the shaft member 64 is not press-fitted over the entire through hole 66a of the output member 66, the shaft member 64 and the output member 66 are at least at two locations (region R1 and region R2). The shaft member 64 can be prevented from dropping from the output member 66 by being fixed to each other.

  The shaft member 64 is fixed to the output member 66 so that a clearance is formed between the first member 64a and the output member 66 between the tip (region R1) and the region R2 near the boundary (region R3). It is configured. Thereby, a force required when assembling the shaft member 64 and the output member 66 can be suppressed, and deformation and cracking of components can be suppressed, and productivity can be improved.

  The shaft member 64 has a plurality of first protrusions 64d (or a plurality of first projections) formed in an annular shape with a gap between the annular first end face 64c, which is a step between the first portion 64a and the second portion 64b. (Concave portion). The output member 66 is formed in an annular shape with a gap between the second end surface 66b facing the first end surface 64c, and is formed to engage with the plurality of first convex portions 64d (or the plurality of first concave portions). A plurality of second concave portions 66c (or a plurality of second convex portions) are provided. A plurality of first convex portions 64d (or a plurality of first concave portions) and a plurality of second concave portions 66c (or a plurality of second convex portions) are press-fitted.

  As described above, the present invention has been described with reference to the above-described embodiment. However, the present invention is not limited to the above-described embodiment, and the present invention can be appropriately combined or replaced with the configuration of the embodiment. It is included in the present invention. In addition, it is possible to appropriately change the combination and processing order in the embodiment based on the knowledge of those skilled in the art and to add various modifications such as various design changes to the embodiment. The described embodiments can also be included in the scope of the present invention.

  DESCRIPTION OF SYMBOLS 10 Motor part, 12 Reduction gear, 13 Output shaft, 14 Gear box, 40 Shaft member, 40a Small diameter part, 40b Large diameter part, 40c 1st end surface, 40d 1st convex part, 40e Groove, 40f Locking part, 40g 1st 1 convex part, 40h protrusion part, 41 serration part, 41a peak part, 41b valley part, 42 gear member, 42a hole, 42b outer peripheral part, 42c tooth, 42d groove, 42e 2nd end face, 42f 2nd recessed part, 42h 2nd Convex part, 42j tooth bottom, 100 motor with reduction gear.

Claims (16)

An output shaft used for a reducer,
A shaft member, and an output member fixed to the shaft member,
The shaft member is
A serration portion consisting of peaks and valleys alternately arranged in the circumferential direction and extending in the axial direction;
A plurality of first convex portions or a plurality of first concave portions formed in an annular shape at intervals on an annular first end face intersecting the axial direction,
The output member is
A plurality of axially extending grooves to engage the serration portion;
A plurality of second recesses or a plurality of second recesses or a plurality of second recesses formed in an annular shape at intervals on the second end surface facing the first end surface and engaged with the plurality of first projections or the plurality of first recesses An output shaft comprising: a second convex portion. The shaft member has a first portion and a second portion continuous to the first portion,
The output member is fixed to the first portion;
The serration portion is formed on the outer peripheral portion of the first portion,
The first end surface is a step between the first portion and the second portion;
The output member is
A hole formed in the center of the output member into which the first portion enters;
A plurality of teeth formed on the outer periphery,
The output shaft according to claim 1, further comprising: the plurality of grooves formed on an inner periphery of the hole. The shaft member has a first portion and a second portion continuous to the first portion,
The output member is fixed to the first portion;
The serration portion is formed on an inner peripheral portion of the first portion,
The first end surface is a surface in contact with the output member of the first portion;
The output member is
An entry portion formed at the center of the output member and entering the first portion;
The output shaft according to claim 1, further comprising: the plurality of grooves formed on an outer periphery of the entry portion.   The output shaft according to claim 2, wherein the output member has the groove formed between a center of the hole and the tooth. The shaft member has the plurality of first protrusions,
The output member has the plurality of second recesses,
The output shaft according to claim 2 or 4, wherein the output member has the second recess formed between a center of the hole and the tooth.   The said shaft member, The said peak part of the said serration part is formed between the axial center of the said 1st part, and the said 1st convex part, The any one of Claim 2 thru | or 5 characterized by the above-mentioned. Output shaft as described.   The output shaft according to claim 2, wherein the output member has the second convex portion formed between a center of the hole and a tooth bottom between the teeth. .   3. The output shaft according to claim 2, wherein the first portion has a locking portion in which a tip portion protruding from the hole of the output member is deformed.   The output shaft according to claim 1, wherein the shaft member and the output member are made of sintered metal.   The output shaft according to claim 9, wherein the output member is carburized and quenched.   9. The output shaft according to claim 2, wherein the number of the crests of the serration unit is an integral multiple of the number of teeth. An output shaft used for a reducer,
A shaft member having a first portion and a second portion continuous to the first portion;
An output member fixed to the first portion of the shaft member,
The output member is
A hole formed in the center of the output member into which the first portion enters and the tip of the first portion protrudes;
The shaft member is
The tip is fixed to the output member with the tip of the first portion protruding from the hole of the output member, and a region near the boundary between the first portion and the second portion is the output. An output shaft characterized by being fixed to a member.   The shaft member is configured such that a clearance is formed between the output member and the output member between the tip and a region in the vicinity of the boundary in the state of being fixed to the output member. The output shaft according to claim 12, wherein The shaft member has a plurality of first protrusions or a plurality of first recesses formed in an annular shape with an interval on an annular first end surface which is a step between the first portion and the second portion. And
The output member is formed in an annular shape with a second end face opposed to the first end face at an interval, and is formed to engage with the plurality of first protrusions or the plurality of first recesses. A second concave portion or a plurality of second convex portions;
The output according to claim 12 or 13, wherein the plurality of first convex portions or the plurality of first concave portions, and the plurality of second concave portions or the plurality of second convex portions are press-fitted. axis. A worm that transmits the rotation of the motor;
A worm wheel meshing with the worm;
The output shaft according to any one of claims 1 to 14, wherein the output shaft is engaged with a driven member to drive the driven member.
A transmission mechanism for transmitting rotation of the worm wheel to the output shaft;
A housing for housing the worm wheel;
A speed reducer characterized by comprising: A motor,
The speed reducer according to claim 15 connected to a shaft of the motor;
A motor with a speed reducer.

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