CN104675969A - Speed reducer - Google Patents
Speed reducer Download PDFInfo
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- CN104675969A CN104675969A CN201410382483.6A CN201410382483A CN104675969A CN 104675969 A CN104675969 A CN 104675969A CN 201410382483 A CN201410382483 A CN 201410382483A CN 104675969 A CN104675969 A CN 104675969A
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- speed reducer
- bolt
- input shaft
- diameter portion
- motor
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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
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/029—Gearboxes; Mounting gearing therein characterised by means for sealing the gearboxes, e.g. to improve airtightness
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Abstract
The invention provides a speed reducer which reduces the probability of leak of a lubricant in the speed reducer from the inside of an input shaft to a motor side. The speed reducer (10) comprises an input shaft (12). The input shaft (12) is provided with a motor shaft insertion hole (12B) at the motor side end (12A) and provided with a pinion (18) engaged with a distribution gear (16) at the end (12D) of the side opposite the motor. The speed reducer (10) comprises a bolt insertion hole (12G) penetrating from the end face (12F) of the input shaft toward the motor shaft insertion hole; the bolt insertion hole comprises a large-diameter portion (12G1) for holding the head (80A) of a connecting bolt (80) and a small-diameter portion (12G2) used for insertion of the shaft (80B) of the connecting bolt. The chamfering amount (Hch1) of a first chamfer portion (CH1) of the large-diameter portion is greater than the chamfering amount (Hch2) of a second chamfer portion (CH2) of the small-diameter portion. A sealing gasket (90) is arranged between the head of the connecting bolt and the bottom surface (12G1a) of the large-diameter portion.
Description
The application advocates the preference of No. 2013-245485th, the Japanese patent application based on application on November 27th, 2013.All the elements of this Japanese publication are by reference to being applied in this specification.
Technical field
The present invention relates to a kind of speed reducer.
Background technique
Such as in patent documentation 1, disclose a kind of linking with motor and the speed reducer used as shown in Figure 5.The end face 915A in the input shaft 913 of this speed reducer 911 at one end portion 915 has the motor drive shaft patchhole 919 inserting motor drive shaft 917.Further, the small gear 925 engaged with the gear 923 of speed reducer 911 is provided with at the periphery 921B of the other end 921.And, there is at the end face 921A of the other end 921 bolt-inserting hole 929 inserted for the binder bolt 927 linked with motor drive shaft 917.
Further, as shown in dash-dot lines in fig. 5, by making the binder bolt 927 being inserted in bolt-inserting hole 929 screw togather with the end face 917A of the speed reducer side of motor drive shaft 917, input shaft 913 and motor drive shaft 917 are linked.
Patent documentation 1: Japanese Unexamined Patent Publication 2012-57672 publication (Fig. 2)
But, in the speed reducer 911 of input shaft 913 with said structure, there are the following problems: for input shaft 913 and oiling agent in speed reducer 911 that the small gear 925 etc. of motor opposite side lubricates likely enter into the inside of input shaft 913 via bolt-inserting hole 929, and leak into motor-side.
Summary of the invention
The present invention completes to solve this problem in the past, and its problem is to provide a kind of internal leakage of the oiling agent in speed reducer via input shaft that can reduce to the speed reducer of the possibility of motor-side.
The present invention solves above-mentioned problem by being set to following structure: a kind of speed reducer, it has input shaft, described input shaft at one end portion has the motor drive shaft patchhole inserted for motor drive shaft, and the small gear with the gears meshing of speed reducer is provided with in the other end, described speed reducer has and to run through from the end face of described the other end of described input shaft towards described motor drive shaft patchhole and the bolt-inserting hole be inserted with for the bolt linked with motor drive shaft, this bolt-inserting hole has the large-diameter portion of the header arrangement for described bolt, and for this bolt axle portion inserted through minor diameter part, the 1st chamfered section is formed with the inner circumference edge of motor opposite side at described large-diameter portion, the 2nd chamfered section is formed with the inner circumference edge of motor opposite side at described minor diameter part, the chamfering amount of described 1st chamfered section is greater than the chamfering amount of described 2nd chamfered section, seal washer is configured with between the head and the bottom surface of described large-diameter portion of described bolt.
In the present invention, have from the end face of input shaft towards the bolt-inserting hole that motor drive shaft patchhole runs through for bolt header arrangement large-diameter portion and for bolt axle portion inserted through minor diameter part.Large-diameter portion be greater than minor diameter part with the chamfering amount of the 1st chamfered section of the inner circumference edge of motor opposite side with the chamfering amount of the 2nd chamfered section of the inner circumference edge of motor opposite side.Further, between the head and the bottom surface of large-diameter portion of bolt, seal washer is configured with.
Thereby, it is possible to the possibility that reduction oiling agent leaks from the bolt-inserting hole of input shaft.
According to the present invention, the internal leakage of the oiling agent in speed reducer via input shaft can be reduced to the possibility of motor-side.
Accompanying drawing explanation
Fig. 1 is the overall sectional view of the structure of the speed reducer involved by an example representing embodiments of the present invention.
Fig. 2 is the amplification view near the input shaft of Fig. 1.
Fig. 3 is side view when observing the speed reducer of Fig. 1 from motor-side.
The input shaft of above-mentioned speed reducer is taken out sectional view that represent, that comprise enlarged partial cross-sectional by Fig. 4.
Fig. 5 is the overall sectional view of an example of the speed reducer represented in the past.
In figure: 10-speed reducer, 12-input shaft, 12A-motor-side end (end), 12B-motor drive shaft patchhole, 12C-bottom surface, the end (the other end) of 12D-and motor opposite side, 12F-end face, 12G-bolt-inserting hole, 12G1-large-diameter portion, 12G2-minor diameter part, 14-motor drive shaft, 16-distribution gear, 18-small gear, 22-bent axle, 62,64-oil sealing, 80-binder bolt.
Embodiment
Below, with reference to the accompanying drawings an example of embodiments of the present invention is described in detail.
Fig. 1 is the overall sectional view of the structure of the speed reducer involved by an example representing embodiments of the present invention.Further, Fig. 2 is the amplification view near the input shaft of Fig. 1, and Fig. 3 is side view when observing the speed reducer of Fig. 1 from motor-side.
This speed reducer 10 has the reducing gear 11 of the eccentric oscillating-type being referred to as distribution type, and for driving the joint of not shown mechanism hand.
In speed reducer 10 involved by this mode of execution, the power of motor 13 is transfused to by the input shaft 12 of so-called connection shaft type.About the structure of the periphery of input shaft 12, will describe in detail afterwards.
The small gear 18 engaged with multiple (in this example be 3, only illustrate 1) distribution gear 16 is provided with at input shaft 12.That is, small gear 18 engages with 3 distribution gears 16 of speed reducer 10 simultaneously.Each distribution gear 16 links with bent axle 22 respectively.
Bent axle 22 is provided with 3 (with reference to figure 3) in this embodiment, and offsets R1 circumferentially at the axle center O1 from internal gear 24 described later, configures respectively with the interval of 120 degree.
On each bent axle 22, axial same position is formed with the 1st eccentric body 26 respectively, and adjacently with the 1st eccentric body 26 in axial same position, is formed with the 2nd eccentric body 28 respectively.1st eccentric body 26 of each bent axle 22 each other and the 2nd eccentric body 28 eccentric phase each other consistent.The eccentric phase difference of the 1st eccentric body 26 and the 2nd eccentric body 28 is 180 degree (eccentric to direction away from each other).
In the periphery of the 1st eccentric body 26 of each bent axle 22, be assembled with the 1st external gear 32 by the 1st eccentric body bearing 30 be made up of roller.In the periphery of the 2nd eccentric body 28 of each bent axle 22, be assembled with the 2nd external gear 36 by the 2nd eccentric body bearing 34 be also made up of roller.
Thus, the 1st eccentric body 26 on 3 bent axles 22 can synchronous rotary and the 1st external gear 32 is swung, and similarly, the 2nd eccentric body 28 on 3 bent axles 22 can synchronous rotary and the 2nd external gear 36 is swung.The eccentric phase difference (eccentric phase based on the 1st eccentric body 26 and the 2nd eccentric body 28 is poor) of the 1st external gear 32 and the 2nd external gear 36 is 180 degree.
Be configured with the 1st wheel carrier 40, the 2nd wheel carrier 42 in the axial both sides of the 1st external gear 32, the 2nd external gear 36, each bent axle 22 is supported on the 1st wheel carrier 40, the 2nd wheel carrier 42 by a pair tapered roller bearing 44,46.1st wheel carrier 40, the 2nd wheel carrier 42 are supported on shell 52 by a pair tapered roller bearing 48,50.In addition, the 1st wheel carrier 40, the 2nd wheel carrier 42 by being pressed in the 1st wheel carrier 40 and running through the wheel carrier pin 54 of the 1st external gear 32, the 2nd external gear 36, and by wheel carrier bolt 56, are linked and integration.
1st external gear 32, the 2nd external gear 36 and internal gear 24 internal messing.In this embodiment, internal gear 24 is by the internal gear main body 24A integrated with shell 52 and be rotatably assembled in this internal gear main body 24A and the export trade 24B forming the internal tooth of this internal gear 24 is formed.The number of teeth (radical of export trade 24B) of internal gear 24 is more more a little than the number of teeth of the 1st external gear 32, the 2nd external gear 36 (in this example only many 1).
In present embodiment, shell 52 is linked with by bolt (only illustrating bolt hole 52A) the 1st arm (omitting diagram) of mechanism hand, 1st wheel carrier 40 is linked with by bolt (only illustrating screw 40A) the 2nd arm (object machinery, omits diagram) of mechanism hand.
The reducing gear 11 of this speed reducer 10 operates with the state of being undertaken lubricating by lubricant (for lubricating grease in this example, but also can lubricate by any one in lubricating grease or lubricant oil).In order to seal the inside of speed reducer 10, between input shaft 12 and electric motor connector 60, be configured with oil sealing 62, and be configured with oil sealing 64 between the 1st wheel carrier 40 and the 2nd wheel carrier 52.
And, in this embodiment, when the 2nd arm (the object machinery) of the axial end 40B of link the 1st wheel carrier 40 and mechanism hand, seal by being coated with aqueous liner (omit and illustrate) etc. between the axial end 40B and the 2nd arm of the 1st wheel carrier 40.Further, the linking department between shell 52 and the 1st arm is also sealed by aqueous liner etc.In addition, symbol 66 is the sealing cover of the crankshaft hole 40F of covering the 1st wheel carrier 40, and symbol 68 is the sealing cover covering input shaft bore 40G.
Further, the inner space P1 comprising the speed reducer 10 of the small gear 18 of input shaft 12, relative to the space outerpace P2 of speed reducer 10 of inside comprising motor 13, is sealed by following structure.
Fig. 4 is sectional view that the input shaft 12 of above-mentioned speed reducer 10 is taken out expression, that comprise enlarged partial cross-sectional.Below, the structure of Primary Reference Fig. 2 and Fig. 4 to the periphery of the input shaft 12 of the speed reducer 10 involved by present embodiment is described in detail.
As mentioned above, in the speed reducer 10 involved by this mode of execution, the power of motor 13 is transfused to by input shaft 12.
The diameter of motor 13 side of input shaft 12 is comparatively thick, more gives prominence to towards axial outside (motor-side) than the 2nd wheel carrier 42.The radial direction central authorities of input shaft 12 at one end portion and motor-side end 12A have the motor drive shaft patchhole 12B of motor drive shaft 14 inserting motor 13.
Motor drive shaft 14 is inserted in this motor drive shaft patchhole 12B of input shaft 12, until abut with bottom surface 12C, and is integrated in a circumferential direction by key 76 and input shaft 12.The screw 14B screwed togather for binder bolt 80 described later is formed at the axial end 14A of motor drive shaft 14.
Input shaft 12 thinner than the diameter of motor-side with the diameter of motor opposite side, and be configured at the radial direction central authorities of the reducing gear 11 of speed reducer 10.
As previously mentioned, namely the end 12D of motor opposite side is provided with the small gear 18 simultaneously engaged with 3 distribution gears 16 in the other end of input shaft 12.That is, this mode of execution is equivalent to following structure example: speed reducer 10, for having the speed reducer of the eccentric oscillating-type of multiple bent axle 22, is the distribution gear 16 being arranged at this bent axle 22 with small gear 18 meshed gears of input shaft 12.
At input shaft 12, end face (end face of the other end) 12F of the end 12D of motor opposite side is provided with the bolt-inserting hole 12G run through towards the motor drive shaft patchhole 12B inserting motor drive shaft 14 from this end face 12F.The described binder bolt 80 for linking input shaft 12 and motor drive shaft 14 is inserted in bolt-inserting hole 12G.Bolt-inserting hole 12G have large-diameter portion 12G1 that the head 80A for this binder bolt 80 configures and for this binder bolt 80 axle portion 80B inserted through minor diameter part 12G2.In addition, in the binder bolt 80 involved by present embodiment, be only formed with screw section 80C in the forward end of axle portion 80B, but according to the kind of binder bolt, also can be formed with screw section 80C throughout whole axle portion 80B.The formation length of the screw section 80C of binder bolt is not particularly limited (can be the binder bolt being only formed with screw section in forward end, also can be the binder bolt being directly formed with screw section from head).
With reference to figure 4, input shaft 12 large-diameter portion 12G1 be formed with the 1st chamfered section CH1 with the inner circumference edge of motor opposite side.Further, the 2nd chamfered section CH2 is formed with at minor diameter part 12G2 with the inner circumference edge of motor opposite side.
In this embodiment, the 1st chamfered section CH1 is formed as follows: with axial cross section (cross section of Fig. 2, Fig. 4) upper with axle center (axle center of=internal gear 24) O1 of input shaft 12 between there is the angulation of 30 degree plane CH1c cut large-diameter portion 12G1 with the inner circumference edge of motor opposite side and being formed.Height of formation in the radial direction of the 1st chamfered section CH1 is Hch1.
On the other hand, in this embodiment, the 2nd chamfered section CH2 is formed as follows: cut being formed (so-called C chamfered) with the inner circumference edge of motor opposite side of minor diameter part 12G2 with the plane CH2c of the angulation on axial cross section and between the axle center O1 of input shaft 12 with 45 degree.Height of formation in the radial direction of the 2nd chamfered section CH2 is Hch2.In addition, the angulation of the 1st chamfered section CH1, the 2nd chamfered section CH2 is not limited to 30 degree and 45 degree, as long as relative to axle center O1 with the angular slope of regulation.
In this mode of execution, height of formation Hch1, Hch2 in radial direction are defined as chamfering amount.According to this definition, the 1st chamfered section CH1 formed with the inner circumference edge of motor opposite side of large-diameter portion 12G1 chamfering amount (the height of formation Hch1 in radial direction) than the 2nd chamfered section CH2 formed with the inner circumference edge of motor opposite side at minor diameter part 12G2 chamfering amount (the height of formation Hch2 in radial direction) more greatly (Hch1 > Hch2).
Specifically, in this mode of execution, design into about 3 times (Hch1 ≈ 3Hch2).Qualitative, as long as the chamfering amount of the 1st chamfered section CH1 is greater than the chamfering amount of the 2nd chamfered section CH2, but more preferably guarantee that following size is poor: " large more than 2.0 times of the chamfering amount (the height of formation Hch2 in radial direction) of chamfering amount (the height of formation Hch1 in radial direction) ratio the 2nd chamfered section CH2 of the 1st chamfered section CH1 " (Hch1 >=2.0Hch2).
By the way, the 3rd chamfered section CH3 is formed with at the inner circumference edge of the motor-side of large-diameter portion 12G1.3rd chamfered section CH3 is formed as follows: carry out cutting with the circular arc C H3r just connected with the inner circumferential of this large-diameter portion 12G1 and bottom surface 12G1a on axial cross section and formed (so-called R chamfered).Height of formation in the radial direction of the 3rd chamfered section CH3 is Hch3.
Further, the 4th chamfered section CH4 is formed with at the inner circumference edge of motor drive shaft patchhole 12B.In this mode of execution, the axial cross section of the 4th chamfered section expands until radial dimension reaches radial dimension Hch4c ' along the plane CH4c ' relative to axle center O1 with the angulation of 30 degree, edge has the plane CH4c of the angulation of 60 degree further " expand until radial dimension reaches radial dimension Hch4c ", thus, the height of formation implemented in radial direction adds up to the machining of Hch4.That is, in this mode of execution, Hch4 > Hch1 > Hch3 > Hch2.Namely, in chamfering amount (height of formation in radial direction), 4th chamfered section CH4 of the inner circumference edge of motor drive shaft patchhole 12B is maximum, reducing with the order of the 3rd chamfered section CH3 of the inner circumference edge of the 1st chamfered section CH1 of the inner circumference edge of motor opposite side, the motor-side of large-diameter portion 12G1 then successively with large-diameter portion 12G1, minor diameter part 12G2's is minimum with the 2nd chamfered section CH2 of the inner circumference edge of motor opposite side.
Further, between the head 80A and the bottom surface 12G1a of large-diameter portion 12G1 of binder bolt 80, seal washer 90 is configured with.Seal washer 90 is in the local of surface of contact or is assembled with the elastomeric packing ring with sealing function throughout the complete cycle of whole supporting surface.That is, seal washer 90 seals the gap between binder bolt 80 and input shaft 12 in the mode blocking the 2nd chamfered section CH2.
The axial length L 12G1 of large-diameter portion 12G1 is set as that the bottom surface 12G1a of this large-diameter portion 12G1 is positioned at the position that the position L18 (Fig. 2) engaged with distribution gear 16 than described small gear 18 more leans on axial motor side.In present embodiment, be set as that position (end) P18 of motor-side that axially leans on most be positioned at than the facewidth W18 of small gear 18 more leans on the position of the amount of axial motor side δ L18 further.That is, when making to observe from radial direction, the position L18 that small gear 18 and distribution gear 16 engage and head 80A can not be overlapping.
Then, the effect of the speed reducer 10 of this eccentric oscillating-type is described.
If motor 13 rotates, be then formed at rotating with the small gear 18 of motor opposite side end (the other end) 12D of input shaft 12.Because small gear 18 engages with 3 distribution gears 16 simultaneously, engaging therefore by this small gear 18 and distribution gear 16,3 bent axles 22 rotate with same synchronization in the same direction with the state of slowing down according to the gear ratio of small gear 18 and distribution gear 16.
Its result, be respectively formed at 3 the 1st eccentric body 26 synchronous rotaries of the axial same position of each bent axle 22 and the 1st external gear 32 is swung, and be respectively formed at 3 the 2nd eccentric body 28 synchronous rotaries of the axial same position of bent axle 22 and the 2nd external gear 36 is swung.
Due to the 1st external gear 32, the 2nd external gear 36 respectively with internal gear 24 internal messing, therefore the 1st external gear 32, the 2nd external gear 36 often swing 1 time, and the phase place of the circumferencial direction of the 1st external gear 32, the 2nd external gear 36 offsets (rotation) and the poor suitable amount of the number of teeth (being 1 tooth amount in present embodiment) relative to internal gear 24.This rotation composition is passed to the 1st wheel carrier 40, the 2nd wheel carrier 42 as each bent axle 22 around the revolution of the axle center O1 of internal gear 24.
1st wheel carrier 40, the 2nd wheel carrier 42 by wheel carrier pin 54 and wheel carrier bolt 56 connected to each other, result, by the rotation of input shaft 12, can make the 2nd arm being linked to the 1st wheel carrier 40 relatively rotate relative to the 1st arm being linked to shell 52.
At this, in this speed reducer 10, various slip surface or rotation surface are lubricated by oiling agent.Oiling agent is sealed in the inner space P1 of speed reducer 10 by oil sealing 62,64 or the aqueous liner coating the gap between object machinery etc., and can not leak into the space outerpace P2 of (comprising the inside of motor 13) speed reducer 10.
But, in the past, when various mal-condition occurs simultaneously, there will be oiling agent leaks into motor-side problem via the bolt-inserting hole 929 of input shaft 913 (Fig. 5) occasionally.Further, when exploitation can solve the technology of this problem, inventor etc. check the structure around input shaft 913 in the past, thus obtain following opinion.
For the ease of understanding this opinion, Fig. 5 is used again to be described the structure around input shaft 913 in the past.
In the past when manufacturing input shaft 913, adopt following processing method: (front end is with the support tool of coniform sharpening by (lathe) a pair thimble, omit diagram) clamp the axis central part at the axial two end part of this input shaft 913, and under the state making input shaft 913 rotate, cut the periphery of this input shaft 913 or form small gear 925.Particularly with the example of Fig. 5, the supported portion that thimble is in the past clamped is the chamfered section CH929 of the chamfered section CH919 of the inner circumference edge of motor drive shaft patchhole 919 and the inner circumference edge of bolt-inserting hole 929.
Clamping chamfered section CH919, CH929 add man-hour to input shaft 913, in order to stably support this input shaft 913, need to guarantee that larger these become the chamfered section CH919 of supported portion, the chamfering amount of CH929.Therefore, in the past, especially the chamfering amount of the chamfered section CH929 of the inner circumference edge of bolt-inserting hole 929 is set as larger than the chamfering amount originally required by this bolt-inserting hole 929.
And find, this is set as that larger chamfered section CH929 becomes the main cause of lubricant leakage to motor-side.
But, in order to ensure the stability of supporting adding man-hour, be in fact difficult to the chamfering amount of the chamfered section CH929 of the inner circumference edge of this bolt-inserting hole 929 to be set as less.
Therefore, present embodiment is configured to as follows: using realize the 2nd required chamfered section CH2 of bolt-inserting hole 12G itself function and as the position separately formation of function of the 1st chamfered section CH1 of supported portion input shaft 12 being added to man-hour, thus guarantee respective function with different positions respectively.
Specifically, in the input shaft 12 of this speed reducer 10, the bolt-inserting hole 12G run through towards motor drive shaft patchhole 12B from this end face 12F is set at the axial end 12F of end (the other end) 12D with motor opposite side.This bolt-inserting hole 12G be have large-diameter portion 12G1 that the head 80A for this binder bolt 80 configures and for the axle portion 80B of binder bolt 80 and screw section 80C inserted through the structure of minor diameter part 12G2.And, make binder bolt 80 be inserted in bolt-inserting hole 12G and screw togather with the screw 14B of the axial end 14A being formed in motor drive shaft 14, and be threaded into across seal washer 90 by the head 80A of binder bolt 80 and abut with the bottom surface 12G1a of large-diameter portion 12G1, thus link input shaft 12 and motor drive shaft 14.
Therefore, in present embodiment, the mode become input shaft 12 adds the 1st chamfered section CH1 of the supported portion in man-hour and the chamfering amount of the 4th chamfered section CH4 and becomes Hch1, Hch4 with the height of formation in respective radial direction can be set as comparatively large (without the need to considering the leakage of oiling agent).And, about the chamfering amount (the height of formation Hch2 in radial direction) of the 2nd chamfered section CH2 relative to bolt-inserting hole 12G, (without the need to consider to guarantee to input shaft 12 add the supporting in man-hour stability and) necessary minimal chamfering amount (Hch4 > Hch1 > Hch2) can be suppressed to.Further, under this state, between the head 80A and the bottom surface 12G1a of large-diameter portion 12G1 of binder bolt 80, seal washer 90 is configured with.Its result, can maintain while adding the supporting in man-hour to input shaft 12 well, the sealability of the space outerpace P2 of the speed reducer 10 of the inner space P1 improving speed reducer 10 further and the inside comprising motor 13.In other words, because the chamfering amount of the 2nd chamfered section CH2 is less, therefore, it is possible to be enough to seal between binder bolt 80 and input shaft 12 by seal washer 90.
And, with the end face 921A of motor opposite side, binder bolt 927 is installed itself in the past at input shaft 913, therefore the head 927A of binder bolt 927 has to expose from the end face 921A of input shaft 913, but according to the present embodiment, the head 80A of binder bolt 80 can be configured completely and be contained in large-diameter portion 12G1, therefore the head 80A of binder bolt 80 can not give prominence to from the end face 12F of input shaft 12.
And, with regard to the position of this head 80A (927A), in the past, the head 927A entirety of binder bolt 927 was exposed from the end face 921A of input shaft 913, therefore, oiling agent is sometimes because certain reason is to splash to the chamfered section CH929 at binder bolt 927 place compared with strong pressure.But, according to the present embodiment, after first oiling agent enters into large-diameter portion 12G1, by the small gap between the periphery of the head 80A of binder bolt 80 and the inner circumferential of large-diameter portion 12G1, then become infiltrating angle the 2nd chamfered section CH2 that footpath just arrives binder bolt 80 place backward.Therefore, when oiling agent arrives the 2nd chamfered section CH2, the force of this oiling agent obviously weakens, and from this point of view, oiling agent is also difficult to leak.
And, in this mode of execution, the axial length L 12G1 of the large-diameter portion 12G1 of bolt-inserting hole 12G is set as that the bottom surface 12G1a of this large-diameter portion 12G1 is positioned at the position L18 engaged with distribution gear 16 than small gear 18, even more leans on the position of the amount of axial motor 13 side δ L18 than the facewidth W18 (axially depending on most the position P18 of motor-side) with small gear 18.Therefore, the radial thickness of input shaft 12 throughout whole small gear 18 facewidth W18 and evenly, thus, small gear 18 is also even with the tooth contact of distribution gear 16, and good engagement can be maintained.
Especially, this structure nonessential structure, according to the relation etc. with the axial dimension of input shaft and the axial position of distribution gear, the bottom surface that also can be designed to such as large-diameter portion is positioned at the axial position that small gear engages with distribution gear.
Further, in above-mentioned mode of execution, following structure example is shown: speed reducer 10, for having the speed reducer of the eccentric oscillating-type of multiple bent axle 22, is multiple distribution gears 16 being arranged at bent axle 22 with small gear 18 meshed gears.In the speed reducer 10 of this structure, the small gear of input shaft 12 18 is more with the contact points of distribution gear 16, and, the rotation of oiling agent by the multiple distribution gears 16 around small gear 18 and the revolution around small gear 18 and stirred energetically.Further, micro-vibration of input shaft 12 is easily produced.Therefore, oiling agent is become from the beginning easily from the structure that the bolt-inserting hole 12G of input shaft 12 leaks.Therefore, it is possible to guarantee that the advantage of the processability of input shaft 12 and good sealing is especially large simultaneously.
But speed reducer involved in the present invention necessarily for having the speed reducer of the reducing gear of this structure, also not can be the speed reducer of the reducing gear with simple planetary gear speed reducing mechanism, parallel axle speed reducing machine structure or orthogonal reducing gear etc.Certainly, also distribution gear is not defined as with small gear meshed gears.Further, small gear is not also defined as spur pinion, such as, also can be helical gear or orthogonal small gear etc.
Further, in above-mentioned mode of execution, be configured to motor drive shaft 14 and itself directly insert and be linked to motor drive shaft patchhole 12B.But the present invention is not limited thereto, such as, the axle that also can be configured to be linked to by coupling etc. motor drive shaft 14 is inserted and is linked to this motor drive shaft patchhole 12B.That is, motor drive shaft of the present invention comprises and is linked to the output shaft of motor and the axle rotated integrally with the output shaft of motor by coupling etc.
Claims (6)
1. a speed reducer, it has input shaft, and described input shaft at one end portion has the motor drive shaft patchhole inserted for motor drive shaft, and is provided with the small gear with the gears meshing of speed reducer in the other end, and the feature of described speed reducer is,
Have bolt-inserting hole, this bolt-inserting hole runs through from the end face of described the other end of described input shaft towards described motor drive shaft patchhole, and is inserted with the bolt for linking with motor drive shaft,
This bolt-inserting hole have for described bolt header arrangement large-diameter portion and for this bolt axle portion inserted through minor diameter part,
Be formed with the 1st chamfered section at described large-diameter portion with the inner circumference edge of motor opposite side, be formed with the 2nd chamfered section at described minor diameter part with the inner circumference edge of motor opposite side,
The chamfering amount of described 1st chamfered section is greater than the chamfering amount of described 2nd chamfered section,
Seal washer is configured with between the head and the bottom surface of described large-diameter portion of described bolt.
2. speed reducer according to claim 1, is characterized in that,
The axial length of described large-diameter portion is set to that the axial position of the described bottom surface of this large-diameter portion is positioned at and more leans on axial motor side than the position of described small gear and described gears meshing.
3. speed reducer according to claim 2, is characterized in that,
The axial length of described large-diameter portion is set to that the axial position of the described bottom surface of this large-diameter portion is positioned at and more leans on motor-side than the end of described small gear.
4. the speed reducer according to Claims 2 or 3, is characterized in that,
When the axial length of described large-diameter portion is set to and observes from radial direction, the head of described bolt is not overlapping with the position of described small gear and described gears meshing.
5. the speed reducer according to any one of Claims 1 to 4, is characterized in that,
This speed reducer is the speed reducer of the eccentric pendulum-type with multiple bent axle, and the described gear engaged with described small gear is the gear being arranged at this bent axle.
6. the speed reducer according to any one of Claims 1 to 5, is characterized in that,
The chamfering amount of described 1st chamfered section is more than 2 times of the chamfering amount of described 2nd chamfered section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013245485A JP6059643B2 (en) | 2013-11-27 | 2013-11-27 | Reduction gear |
| JP2013-245485 | 2013-11-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104675969A true CN104675969A (en) | 2015-06-03 |
| CN104675969B CN104675969B (en) | 2017-04-26 |
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| CN201410382483.6A Active CN104675969B (en) | 2013-11-27 | 2014-08-06 | Speed reducer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106838134A (en) * | 2015-10-02 | 2017-06-13 | 纳博特斯克有限公司 | Speed reducer for rotary table |
| CN110890809A (en) * | 2018-09-10 | 2020-03-17 | 住友重机械工业株式会社 | Gear motor |
| CN111482987A (en) * | 2019-01-28 | 2020-08-04 | 发那科株式会社 | Robot |
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| KR101791345B1 (en) * | 2016-06-30 | 2017-10-27 | 현대위아 주식회사 | Servo-motor for lathe tool post |
| JP6767290B2 (en) * | 2017-03-10 | 2020-10-14 | 住友重機械工業株式会社 | Planetary gear device |
| JP7204289B2 (en) * | 2018-04-18 | 2023-01-16 | 住友重機械工業株式会社 | gearbox |
| JP7000304B2 (en) | 2018-12-26 | 2022-01-19 | ファナック株式会社 | Robot seal structure and robot |
| US20240291351A1 (en) | 2021-11-12 | 2024-08-29 | Fanuc Corporation | Pinion-equipped motor and gear mechanism provided with pinion-equipped motor |
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| CN106838134B (en) * | 2015-10-02 | 2021-06-11 | 纳博特斯克有限公司 | Speed reducer for rotary table |
| CN110890809A (en) * | 2018-09-10 | 2020-03-17 | 住友重机械工业株式会社 | Gear motor |
| CN110890809B (en) * | 2018-09-10 | 2023-12-15 | 住友重机械工业株式会社 | Gear motor |
| CN111482987A (en) * | 2019-01-28 | 2020-08-04 | 发那科株式会社 | Robot |
| CN111482987B (en) * | 2019-01-28 | 2023-12-29 | 发那科株式会社 | Robot |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6059643B2 (en) | 2017-01-11 |
| JP2015102221A (en) | 2015-06-04 |
| CN104675969B (en) | 2017-04-26 |
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