CN102996771A

CN102996771A - Eccentric swinging type speed reducer

Info

Publication number: CN102996771A
Application number: CN201210344641XA
Authority: CN
Inventors: 石川哲三; 芳贺卓; 志津庆刚
Original assignee: Sumitomo Heavy Industries Ltd
Current assignee: Sumitomo Heavy Industries Ltd
Priority date: 2011-09-16
Filing date: 2012-09-17
Publication date: 2013-03-27
Anticipated expiration: 2032-09-17
Also published as: DE102012017494B4; CN102996771B; JP2013064451A; DE102012017494A1; JP5654972B2

Abstract

The present invention provides an eccentric swinging type speed reducer for raising lubricity of a bearing which relatively supports an eccentric body shaft and further prolonging the service life of the bearing. The eccentric swinging type speed reducer comprises a first lubrication channel (222) which is formed along an axial direction in the eccentric body shaft (271) and capable of enabling lubricating oil to inflow, and a second lubrication channel (224) which is communicated with the first lubrication channel (222) and is formed by extending along a radial direction, wherein the second lubrication channel (224) is provided with an opening between first and second roller bearings (278, 279) and first and second eccentric bodies (214, 216).

Description

The eccentric oscillating-type speed reducer

Technical field

The present invention relates to a kind of eccentric oscillating-type speed reducer.

Background technique

Disclose the eccentric oscillating-type speed reducer in the patent documentation 1.

In this speed reducer, a plurality of external gears are spread configuration vertically, and meshes with internal gear when swinging by the eccentric body that is arranged on eccentric shaft separately.The number of teeth of the internal tooth of internal gear and the external tooth of external gear is poor to be set as " 1 ".And, constitute when the interior side oscillation of external gear at internal gear, take out the relative rotation according to internal gear with the external gear of the poor generation of this number of teeth.

Eccentric shaft is supported on wheel carrier by bearing.

Patent documentation 1: TOHKEMY 2008-202764 communique (Fig. 1)

In life-span in order to ensure the bearing that supports this eccentric shaft, become important to this bearing Enough supply oiling agent.

Summary of the invention

Problem of the present invention is to provide a kind of eccentric oscillating-type speed reducer, and it improves the lubricity for the bearing of supporting eccentric shaft, and further prolongs the life-span of this bearing.

The present invention solves above-mentioned problem by being made as following structure: a kind of eccentric oscillating-type speed reducer, it possesses external gear, with the internal gear of this external gear engagement, have the eccentric shaft that makes the eccentric body that described external gear swings, and support the wheel support body of this eccentric shaft by bearing, this eccentric oscillating-type speed reducer possesses: the 1st lubrication channel, in described eccentric shaft, form vertically, and lubricant oil is flowed into; And the 2nd lubrication channel, being communicated with the 1st lubrication channel, and radially extending to form, the 2nd lubrication channel is opening between described bearing and eccentric body.

Among the present invention, in eccentric shaft, form vertically the 1st lubrication channel, radially form the 2nd lubrication channel.

And, make the 2nd lubrication channel opening between the bearing that supports eccentric shaft and eccentric body.Therefore, can supply with sufficient oiling agent to the bearing of supporting eccentric shaft, and can improve the life-span of this bearing.The invention effect

According to the present invention, in the eccentric oscillating-type speed reducer, can supply with sufficient oiling agent to the bearing of supporting eccentric shaft, and can further prolong the life-span of this bearing.

Description of drawings

Fig. 1 is the global sections figure that represents in order to understand the present invention one example of eccentric oscillating-type speed reducer as a reference.

Fig. 2 is the sectional view along the arrow II-II line of Fig. 1, and the sectional view of the maximum load position of expression during forward.

Fig. 3 is the sectional view along the arrow III-III line of Fig. 1, and the sectional view of the maximum load position in when counter-rotating expression.

Fig. 4 is the global sections figure that represents in order to understand the present invention another example of eccentric oscillating-type speed reducer as a reference.

Fig. 5 is the major component amplification sectional view of the eccentric oscillating-type speed reducer of Fig. 4.

Fig. 6 is the global sections figure of the related eccentric oscillating-type speed reducer of an example of embodiments of the present invention.

Fig. 7 is the major component amplification sectional view of the eccentric oscillating-type speed reducer of Fig. 6.

Among the figure: 10,12-the 1st, the 2nd external gear, 14,16-the 1st, the 2nd eccentric body, 18-internal gear, 20-input shaft (eccentric shaft), 22-the 1st lubrication channel, 24-the 2nd lubrication channel, 24X-the 1st straight line shape passage, 24Y-the 2nd straight line shape passage, 28,30-the 1st, the 2nd eccentric body bearing, 36,38-the 1st, the 2nd ball bearing, 40,42-the 1st, the 2nd takes turns support body, 52, the 54-main bearing.

Embodiment

Below, at first with reference to figure 1～Fig. 5, to as a reference the example (hereinafter referred to as example for referencial use) of eccentric oscillating-type speed reducer describes in order to understand the present invention, on this basis, according to Fig. 6 and Fig. 7 one example of embodiments of the present invention is elaborated.

Fig. 1 is the global sections figure of the related eccentric oscillating-type speed reducer of reference example, Fig. 2 is the sectional view along the arrow II-II line of Fig. 1, and the sectional view of the maximum load position of expression during forward, the sectional view of the maximum load position when Fig. 3 is same expression counter-rotating.

This speed reducer G1 is vertically spread configuration of the 1st, the 2nd

external gear

10,12, and the eccentric oscillating-type speed reducer that meshes with internal gear 18 when swinging by the 1st, the 2nd eccentric body 14,16 separately.Therefore, speed reducer G1 possesses with the 1st, the 2nd

external gear

10,12 and is formed with accordingly the 1st, the 2nd eccentric body 14,16 the input shaft that is also used as " eccentric shaft " 20.

Possess in the input shaft 20 the 1st lubrication channel 22 that forms is arranged vertically, and be communicated with 4 article of the 2nd lubrication channel 24(24A also radially extending to form～24D) with the 1st lubrication channel 22.The 2nd lubrication channel 24 is opening between the 1st eccentric body 14 and the 2nd eccentric body 16.

Below, begin to describe successively from the structure of this speed reducer G1.

With reference to figure 1, Fig. 2,2 the 1st, the 2nd eccentric body 14,16 are integrally formed on the input shaft (eccentric shaft) 20 of speed reducer G1.That is, input shaft 20 plays a role as the centre-crank formula " eccentric shaft " that is disposed at the axle center O1 of internal gear 18.

1st, in the 2nd eccentric body 14,16, its periphery is with respect to axle center (identical with the O1) off-centre of input shaft 20.1st, the 2nd eccentric body 14,16 eccentric phase skew, 180 degree, the 1st, the 2nd eccentric body 14,16 respectively to the eccentric Δ e(of the diametical direction of radial direction with reference to figure 2).

1st, dispose respectively the 1st, the 2nd eccentric body bearing 28,30 between the 2nd eccentric body 14, the 16 and the 1st, the 2nd external gear 10,12.1st, the 2nd eccentric body bearing 28,30 respectively by the 1st, the 2nd roller (rolling element) 28A, 30A, and the 1st, the 2nd retainer 28B, the 30B of supporting the 1st, the

2nd roller

28A, 30A consist of, do not possess special-purpose Internal and external cycle (effect of the 1st, the 2nd eccentric body 14,16 performance inner rings, the effect of the 1st, the 2nd

external gear

10,12 performance outer rings).

1st, among the 2nd retainer 28B, the 30B, its axial end portion during from end on observation in the form of a ring.The 1st retainer 28B contacts with the end of the mutual opposed opposed faces side of the 2nd retainer 30B, and the end of opposed faces opposition side and the 1st, the 2nd stopper 32,34 contact.1st, the 2nd stopper 32,34 is transfused to end difference 20A, the 20B of axle 20 and (supporting input shaft 20) a pair of ball bearing 36,38 clampings, and location vertically.1st, sandwich the 1st, the 2nd stopper 32 between end difference 20A, the 20B of the 2nd ball bearing 36,38 with its

inner ring

36A, 38A and

input shaft

20,34 state is pressed in this input shaft 20.The outer ring 36B of the 1st ball bearing 36 is by being arranged at the described later the 1st back-up ring 41 of taking turns support body 40, and the outer ring 38B of the 2nd ball bearing 38 carries out respectively axial position limitation by the 2nd end difference 42A that takes turns support body 42.Thus, the result, the axially locating of the 1st, the

2nd roller

28A, 30A is undertaken by the 1st, the 2nd stopper 32, the 34 and the 1st, the

2nd retainer

28B, 30B.

1st, the 2nd

external gear

10,12 internal gears that mesh 18 are made of the cylindric interior alligator 18A that consists of internal tooth and the internal gear main body 18B with supporting cotter way 18B1 of alligator 18A in this.Internal gear main body 18B and shell 44 become one.Shell 44 is fixed in outside fixed component (omitting diagram) by the not shown bolt that is inserted through bolt hole 44A.

The interior number of teeth of internal gear 18 (quantity of interior alligator 18A) is only a little more than the 1st, the 2nd

external gear

10,12 the outer number of teeth (only being 1 in this example).1st, on the 2nd

external gear

10,12, on the 1st, the 2nd

external gear

10,12 the equidistant position of axle center O2, O3 respectively along circumferentially being formed with a plurality of (in this reference example being 10) the 1st, the 2nd penetration hole 10A, 12A.1st, the

2nd penetration hole

10A, 12A separate movable fit in there being slip to promote being sold inside the country on 50 of body 48 coatings.

Dispose the 1st, the 2nd in the 1st, the 2nd

external gear

10,12 axial both sides and take turns support body 40,42.As aforementioned, the 1st, the 2nd takes turns

support body

40,42 by the 1st, the 2nd ball bearing 36,38 supporting input shafts 20, and is supported on shell 44 by main bearing (angular contact ball bearing) 52,54.

The described the sold inside the country the 50 and the 2nd takes turns support body 42 becomes one.The 2nd take turns support body 42 by sold inside the country 50 and bolt 56 and the 1st take turns support body 40 bindings.The 2nd takes turns support body 42 utilizes the driven member of bolt hole 42B and not shown object machinery to link.

At this, the structure of subtend the 1st, the 2nd eccentric body bearing 28,30 supply of lubricant is elaborated.

In the input shaft (eccentric shaft) 20, on by the position of its axle center O1, be formed with vertically the 1st lubrication channel 22 that can flow into lubricant oil.Wherein, the 1st lubrication channel 22 runs through input shaft 20 vertically, has opening 22A, 22B on axial two end part 20C, the 20D of this input shaft 20.That is, become can be from this input shaft 20 opening 22A, the 22B of end 20C, 20D flow into the structure of oiling agent arbitrarily.

And, in the input shaft 20, radially extend to form 4 the 2nd lubrication channel 24(24A that are communicated with the 1st lubrication channel 22～24D).The 2nd lubrication channel 24 (has opening 24A1～24D1) at opening between the 1st eccentric body 14 and the 2nd eccentric body 16 between the 1st eccentric body 14 and the 2nd eccentric body 16.

As shown in Figures 2 and 3, in this reference example, the 2nd lubrication channel 24 is made of the 1st and the 2nd straight line shape passage 24X, 24Y.The 1st straight line shape passage 24X is such as lower channel, namely between the 1st eccentric body 14 and the 2nd eccentric body 16, separate 180 degree phase differences at 2 place's openings (having 2 opening 24A1,24B1 among described 4 opening 24A1～24D1) of circumferencial direction, and 2 article the

2nd lubrication channel

24A, 24B are continuous, thereby the result forms straight line shape passage.The 2nd straight line shape passage 24Y is similarly such as lower channel, namely between the 1st eccentric body 14 and the 2nd eccentric body 16, separate 180 degree phase differences at 2 place's openings (have described 42 of opening among 24A1～24D1 and open 24C1,24D1) of circumferencial direction, and 2 article the

2nd lubrication channel

24C, 24D are continuous, thereby the result forms 1 straight line shape passage.

With reference to figure 2, among the 1st straight line shape passage 24X, as speed reducer G1 during to the forward direction rotation, namely, when input shaft 20 rotates to arrow A 1, when the result takes turns support body 42 to arrow A 2 direction rotation as the 2nd of output block, also identical to the 1st eccentric body bearing 28(the 2nd eccentric body bearing 30 sides) direction that applies maximum load F1 has the described 24A1 of opening, and has the described 24B1 of opening at its opposition side.In addition, the 1st straight line shape passage 24X of this input shaft (eccentric shaft) 20 by by a parts setting and by 1 drilling tool (omit diagram) radially (diametric(al)) wear continuously 2 article of the

2nd lubrication channel

24A, 24B and form.

Equally, with reference to figure 3, among the 2nd straight line shape passage 24Y, when speed reducer G1 rotates to reverse directions, that is, when input shaft 20 to arrow B 1 direction rotation, when the result takes turns support body 42 to arrow B 2 direction rotation as the 2nd of output block, also identical to the 1st eccentric body bearing 28(the 2nd eccentric body bearing 30 sides) direction that applies maximum load F2 has the described 24C1 of opening, and has described opening 24D1 at its opposition side.The 2nd straight line shape passage 24Y also by by a parts setting and by 1 drilling tool radially (diametric(al)) wear continuously 2 article of the

2nd lubrication channel

24C, 24D and form.

Usually, in the eccentric oscillating-type speed reducer, the position (eccentric direction) that applies the position (eccentric direction) of the maximum load F1 of positive veer and apply the maximum load F2 of reverse directions becomes the position that determines by speed reducer.This position is according to diameter or the quantity of interior alligator, and perhaps the offset of eccentric body etc. is slightly different, but take maximum eccentric direction M1(or minimum eccentric direction M2) become general about 45 degree of skew phase angle [alpha] 1(as benchmark) the position.

Then, the effect of this eccentric oscillating-type speed reducer G1 described.

If input shaft 20 rotation, then the 1st, the 2nd eccentric body 14, the rotation of 16 one, and swing when making the phase angle that the 1st, the 2nd

external gear

10,12 keeps 180 degree mutually by the 1st, the 2nd eccentric body bearing 28,30.Thus, 1st, the 2nd

external gear

10,12 and the engaging position of internal gear 18 be offset successively to circumferencial direction, when the 1st, the 2nd eccentric body 14,16 every rotations 1 time, the 1st, the 2nd

external gear

10,12 relative internal gears 18 only relatively rotation (rotation) be equivalent to the amount of the number of teeth poor " 1 ".

This rotation composition by sold inside the country 50(and slide promote body 48) be passed to the 1st, the 2nd and take

turns support body

40,42, further be passed to the not shown driven member that utilizes bolt hole 42B to link.Thus, driven member rotates to the sense of rotation opposite with the sense of rotation of input shaft 20 with the speed of being slowed down.

Wherein, the lubricant oil (oiling agent) in the speed reducer G1 flows into the inside of input shaft 20 by the 1st lubrication channel 22.Centrifugal force that the lubricant oil utilization that flows into is produced by the rotation of this input shaft 20 is through guiding to the space S P1 of the radial outside of this opening 24A1～24D1 from 4 opening 24A1～24D1 between the 1st eccentric body 14 and the 2nd eccentric body 16 towards the 2nd lubrication channel 24 of radial outside.The space S P1 of the radial outside of opening 24A1～24D1 is covered by the 1st retainer 28B and the 2nd retainer 30B, therefore the lubricant oil that flows in this space S P1 enters (arranging to circumferencial direction) the 1st roller 28A gap each other to axial change direction, perhaps the 2nd roller 30A gap each other, and be dispersed throughout periphery, the 1st, the 2nd eccentric body 14,16 periphery, and the 1st, the 2nd external gear 10, interior week of 12 of the 1st, the

2nd roller

28A, 30A by the rotation of the 1st, the

2nd roller

28A, 30A.

The opening 24A1 of the 2nd lubrication channel 24～24D1 total is formed with 4.In the past, owing to be equivalent to the rolling surface that the opening of the passage radially of the 2nd lubrication channel 24 is formed at eccentric body, therefore in order to prevent the damage of this rolling surface or roller as far as possible, be difficult to form a plurality of openings.But, in this reference example, the opening 24A1～24D1 of the 2nd lubrication channel 24 is formed between the 1st, the 2nd eccentric body 14,16 (but not rolling surface), therefore, the problem of rolling surface damage and so on does not occur, and therefore can form without barrier a plurality of opening 24A1～24D1.

And each opening 24A1～24D1 is all the time to the space S P1 opening (opening) between the 1st eccentric body 14 and the 2nd eccentric body 16.That is, can not occur because of the 1st, the

2nd roller

28A, 30A " opening of the 2nd lubrication channel 24 (a part) frequent jams, this moment lubricant oil mobile temporary weak " and so on phenomenon.Therefore, along with forming a plurality of opening 24A1～24D1, can make lubricant oil mobile very swimmingly with the order of the 1st lubrication channel 22 → the 2nd lubrication channel 24 → space S P1.

And, the 2nd related lubrication channel 24 of this reference example is made of the 1st straight line shape passage 24X and the 2nd straight line shape passage 24Y, described the 1st straight line shape passage 24X separates the phase difference of 180 degree at 2 place's openings (opening 24A1,24B1), the result becomes 1 continuous passage, the same phase difference that separates 180 degree of described the 2nd straight line shape passage 24Y is at 2 place's openings (opening 24C1,24D1), and the result becomes 1 continuous passage.Therefore, the 1st, the 2nd straight

line shape passage

24X, 24Y can be by a parts setting by 1 drilling tool (omitting diagram) radially (diametric(al)) wear continuously 2 article of the

2nd lubrication channel

24A, 24B or 24C, 24D form.Therefore, not only can process like a cork not residual cutting powder in the 1st, the 2nd lubrication channel 22,24, and the advantage that can obtain to make the situation because of the rolling surface of this cutting powder damage adjacency to prevent trouble before it happens.Be difficult to arrange the passage radially that is equivalent to the 2nd lubrication channel more than 2 in the past, therefore be made as " end is arranged " (forming to the radiation direction from axle center O1) in the part that is equivalent to the 1st lubrication channel.Therefore, the cutting powder easily remains in the 1st, the 2nd lubrication channel 22,24, in order not make cleaning in its residual must carrying out (so because for key shape or have the end relatively difficult) passage.But according to this reference example, (except 22 one-tenth penetration holes of the 1st lubrication channel) especially the 2nd lubrication channel 24 are formed by " penetration hole " of the 1st and the 2nd straight line shape passage, therefore almost do not cut the residual misgivings of powder.

In addition, the 1st straight line shape passage 24X applies direction and its opposition side of maximum load F1 when being formed on forward, the 2nd straight line shape passage 24Y applies direction and its opposition side of maximum load F2 when being formed on counter-rotating, therefore no matter when forward and during counter-rotating, all can be to the direction Enough supply lubricant oil that applies maximum loads.About this point,, in order to be suppressed to inferior limit to the impact of the lubrication channel of rolling surface opening, had on the contrary to the direction opening of load application not in the past, but in this reference example, can be all the time to the direction supplying lubricating oil that needs most lubricant oil.

Stack according to above a plurality of action effects, among the related speed reducer G1 of this reference example, can prevent the damage of the 1st, the 2nd eccentric body bearing 28,30 rolling surface (the 1st, the 2nd eccentric body 14,16 periphery or the 1st, the periphery of the

2nd roller

28A, 30A), and to this rolling surface Enough supply oiling agent, can greatly prolong the 1st, the 2nd eccentric body bearing 28, life-span of 30.

In addition, about eccentric oscillating-type speed reducer G1, except centre-crank formula speed reducer G1 described above, for example also known have a speed reducer that is called the structure of distributing type (sorting type).

The G2 of this speed reducer shown in Fig. 4 and Fig. 5.

Among this speed reducer G2, the 1st, the 2nd external gear 110,112 is spread configuration vertically also, meshes with internal gear 118 when swinging by the 1st, the 2nd eccentric body 114,116 separately.

But, in above reference example, input shaft 20 with function of eccentric shaft only disposes 1 in the position of the axle center of internal gear 18 O1, but in this reference example, wherein the 1st eccentric shaft 171 of diagram only among the 1st～the 3rd eccentric shaft 171～173(Fig. 4) in the radial direction position from the axle center O4 skew of internal gear 118, to circumferencial direction with uniformly-spaced configuration (3).

Be respectively arranged with the 1st, the 2nd eccentric body 114,116, the 1 eccentric shafts 171 through gear 174 drivings at the 1st～the 3rd eccentric shaft 171～173, thereby the 1st, the 2nd external gear 110,112 carries out swing rotary.In addition, at this moment the 2nd eccentric shaft 172 and the 3rd eccentric shaft 173 are driven state, and support the 1st, the 2nd external gear 110,112, so that the 1st, the 2nd external gear 110,112 carries out swing rotary swimmingly.

1st, the 2nd take turns support body 140,142 and be arranged on the 1st, the 2nd external gear 110,112 axial sidepiece, but and by with the 2nd take turns wheel carrier pin 182 that support body 142 becomes one and bolt 184 and one links rotatably.Described the 1st～the 3rd eccentric shaft 171～173 is supported on the 1st, the 2nd by a pair of the 1st, the 2nd tapered roller bearing 178,179 respectively and takes turns support body 140,142.

Among this speed reducer G2, the 1st, the 2nd external gear 110, the 112 relative rotations with respect to internal gear 118 center on the revolution of the axle center O4 of internal gear 118 as the 1st～the 3rd eccentric shaft 171～173, and take turns support body 140,142 taking-ups from the 1st, the 2nd.

1st, the

2nd roller

128A, 130A utilize the 1st, the 2nd stopper 132,134 to seize its 1st, the

2nd retainer

128B, 130B on both sides by the arms from the axial outside and restrictive axial moves.1st, the 2nd stopper 132,134 is connected to the 1st, the 2nd tapered roller bearing 178,179, and, be connected to the 1st, the 2nd retainer 128B, 130B.1st, the

2nd retainer

128B, 130B also mutual butt each other.Therefore, in this speed reducer G2, lubricant oil still is difficult to arrive near the 1st, the 2nd eccentric body bearing 128,130.

In this speed reducer G2, also can form such as lower channel with same structure: the 1st lubrication channel 122 forms vertically in the 1st～the 3rd eccentric shaft 171～173, and can flow into lubricant oil; And the 2nd lubrication channel 124, be communicated with the 1st lubrication channel 122, and radially extend to form.Concrete structure (for example, aforesaid the 1st, the 2nd straight

line shape passage

124X, 124Y etc.) about the 2nd lubrication channel 124 also can adopt the structure identical with above reference example, can access identical action effect.

In addition, in this reference example, as in Fig. 5, amplifying diagram, radial direction medial extremity 128B1, the 130B1 of the opening 124A1 by the 2nd lubrication channel 124 of the 1st retainer 128B and the 2nd retainer 130B～124D1 side respectively from the state tilt alpha 2 of parallel to an axis.Particularly, the 1st retainer 128B(the 2nd retainer 130B) have keep the 1st roller 128A(the 2nd roller 130A) holding part, and the annulus that extends to radially inner side from the axial two ends of holding part, and the radial direction medial extremity 128B1(130B1 that axial inside part is cut of the radially inner side end periphery by being made as this annulus), make thus it with will be from opening lubricant oil guiding that 124A1～124D1 flows out to the 1st roller 128A(the 2nd roller 130A) inclination.Thus, can with from the 2nd lubrication channel 124 open the flowing swimmingly to axial conversion of lubricant oil that 124A1～124D1 flows out towards radial outside, and guide to the 1st roller 128A(the 2nd roller 130A).In addition, in this reference example, axially the annulus both sides at two ends are with inclination, get final product but the annulus of opening at least the 124A side has inclination.

Namely, in the eccentric oscillating-type speed reducer, if sufficient lubrication be configured in eccentric body bearing between eccentric body and the external gear, and improve the life-span, make the 2nd lubrication channel in the peripheral openings of eccentric body, then in order not make the roller damaged of eccentric body bearing, must fully carry out fine finishing to the opening portion periphery, thereby cause process time, the increase of processing cost.Therefore, if the opening 124A1～124D1 of the 2nd lubrication channel 124 is set between the 1st eccentric body 114 and the 2nd eccentric body 116, then do not have sliding contact between the 1st, the 2nd eccentric body bearing 128,130 the 1st, the

2nd roller

128A, 130A and the opening 124A1～124D1, therefore do not need the processing of opening portion periphery.

But, on the other hand, how will be supplied to from the lubricant oil that opening 124A1～124D1 flows out the 1st, the 2nd eccentric body bearing 128,130 the 1st, the

2nd roller

128A, 130A(and the 1st, the 2nd eccentric body 114,116 slip surface) and become problem.According to this reference example, between the 1st eccentric body 114 and the 2nd eccentric body 116, the 2nd lubrication channel 124 is set, and the radially inner side end of the opening side of the 1st retainer 128 and the 2nd retainer 130B is made as radial direction medial extremity 128B1, the 130B1 with inclination, to guide to the 1st, the

2nd roller

128A, 130A from the lubricant oil that opening 124A1～124D1 flows out, therefore, do not need the opening portion periphery is carried out fine finishing, and sufficient lubrication the 1st, the 2nd eccentric body bearing 128,130, and can improve the life-span.

About other structures, substantially the same with above reference example, therefore to the double figures symbol identical with above reference example after similarly the position adds in the drawings on identical or the function, and omit repeat specification.

One example of embodiments of the present invention shown in Fig. 6 and Fig. 7.

In the related speed reducer G3 of this mode of execution, 2 the 1st, the 2nd external gear 210,212 are spread configuration vertically, and, possess have 3 be provided with the 1st, the 2nd eccentric body 214, eccentric shaft 271～273(of 216 only illustrates eccentric shaft 271).But, among the related speed reducer G3 of this mode of execution, the eccentric shaft gear 274 that is arranged on 3 eccentric shafts 271～273 respectively with common central gear 176 engagements.That is, 3 eccentric shafts 271～273 are all by 176 while of central gear synchronous drive.

Among the speed reducer G3,271～273(only illustrates eccentric shaft 271 by a pair of the 1st, the 2nd roller bearing (bearing of eccentric shaft) 278,279 supporting eccentric shafts).1st, the 2nd roller bearing 278,279 constitutes and does not possess special-purpose inner ring, outer ring, and the outer circumferential face and the 1st, the 2nd that the 1st, the 2nd roller 278A, 279A directly are connected to eccentric shaft 271～273 is taken turns support body 240,242.In this embodiment, to the 1st, the 2nd stopper 232,234 that the axial position of the 1st, the 2nd eccentric body bearing 228 of configuration between the 1st, the 2nd eccentric body 214, the 216 and the 1st, the 2nd external gear 210,212,230 the 1st, the 2nd retainer 228B, 230B limits, be connected to the 1st, the 2nd eccentric body 214,216 and double as the 1st, the 2nd the taking turns support body 240,242 and carry out position limitation of inner ring of main bearing (angular contact ball bearing) 250,252.Described the 1st, the 2nd roller bearing 278,279 of supporting eccentric shaft 271～273 is made of the 1st, the 2nd roller 278A, 279A and the 1st, the 2nd retainer 278B, 279B.1st, back-up ring 281 by being arranged on eccentric shaft 271～273 of the 2nd retainer 278B, 279B, 282 and the pad 283,284 that has both the function of thrust plate come restrictive axial to move.Following situation occurs in the speed reducer G3 of this structure, namely not only be difficult to lubricated the 1st, the 2nd eccentric body bearing 228,230, and because of exist the 1st, the 2nd stopper 232,234 and pad 283,284 the 1st, the 2nd roller bearings 278,279 to supporting eccentric shaft 271～273 also be difficult to supplying lubricating oil.

More specifically, dispose respectively the 1st, the 2nd stopper 232,234 between the 1st, the 2nd roller bearing 278, the 279 and the 1st, the 2nd eccentric body 214,216.And, dispose packing ring 231 between the 1st, the 2nd eccentric body bearing 228,230.The 1st roller bearing 278 comes restrictive axial to move by being clipped between back-up ring 281 and pad 283 and the 1st stopper 232.The 2nd roller bearing 279 comes restrictive axial to move by being clipped between back-up ring 282 and pad 284 and the 2nd stopper 234.The 1st eccentric body bearing 228 is clamped with packing ring 231 by the 1st stopper 232, and the 2nd eccentric body bearing 230 is clamped with packing ring 231 by the 2nd stopper 234, thereby restrictive axial moves respectively.

Wherein, the 1st, the 2nd stopper 232,234 internal diameter are made as the external diameter greater than the eccentric shaft 271 of configuration the 1st, the 2nd stopper 232,234 part, the 1st, the 2nd stopper 232,234 and eccentric shaft 271 between be provided with the gap.And the internal diameter of packing ring 231 is made as the external diameter greater than the part between the 1st eccentric body 214 and the 2nd eccentric body 216, is provided with the gap between packing ring 231 and the eccentric shaft 271.

In the present embodiment, as the 2nd lubrication channel 224, except (identical with above reference example) is arranged on the 1st, the 2nd straight

line shape passage

224X, 224Y between the 1st eccentric body 214 and the 2nd eccentric body 216, also be formed with respectively

lubrication channel

224K, 224L at opening between the 1st roller bearing 278 and the 1st eccentric body 214 and between the 2nd roller bearing 279 and the 2nd eccentric body 216.

The concrete structure of

lubrication channel

224K, 224L can be made as the structure identical with the 2nd lubrication channel of above reference example.In the present embodiment, except the 1st, the 2nd eccentric body bearing 228,230, too can be to the 1st, the 2nd roller bearing 278, the 279 Enough supply lubricant oil of 3 eccentric shafts 271～273.

That is the lubricant oil that, 271 outer circumferential side flows out from

lubrication channel

224K, 224L to eccentric shaft from be arranged on the 1st, the 2nd stopper 232,234 and eccentric shaft 271 between the gap be supplied to the 1st, the 2nd roller bearing 278,279.And the lubricant oil that the outer circumferential side from the 1st, the 2nd straight

line shape passage

224X, 224Y to eccentric shaft 271 flows out is supplied to the 1st, the 2nd eccentric body bearing 228,230 from the gap that is arranged between packing ring 231 and the eccentric shaft 271.

In addition, in the present embodiment,

lubrication channel

224K, 224L separate 180 degree phase differences and at 2 place's openings to the eccentric body 214 of institute's adjacency, 216 maximum eccentric direction and minimum eccentric direction, become 1 continuous straight line shape passage, but the formation position of opening portion can be formed on circumferential any position, also is not particularly limited its number.

And, describe although in Fig. 7, omit, but 1st, the radial direction medial extremity of the lubrication channel 224K of the 2nd roller bearing 278,279 the 1st, the

2nd retainer

278B, 279B, 224L side is identical with the 2nd retainer 130B with the 1st retainer 128B illustrated in fig. 5, be made as from the state with parallel to an axis, can effectively the lubricant oil that flows out from

lubrication channel

224K, 224L be guided to the 1st, the 2nd roller bearing 278,279.

In addition, in above-mentioned reference example or mode of execution, the vertically example of the speed reducer of spread configuration of 2 external gears being shown, is in the speed reducer more than 1 or 3 but the present invention can be applied to external gear.

And, in above-mentioned reference example or mode of execution, the structure of relevant the 2nd lubrication channel is made as and forms the 1st, the 2nd straight line shape passage that runs through to diametric(al), but among the present invention, need not necessarily to consist of the 2nd lubrication channel by this straight line shape passage, for example can be the lubrication channel that extends to radial direction (radiation direction) with the state that is communicated with the 1st lubrication channel.And, also be not particularly limited its number.

In addition, in above-mentioned reference example or mode of execution, the maximum load direction that is made as in positive veer and reverse directions forms the 2nd lubrication channel, but among the present invention, need not and must form the 2nd lubrication channel in the maximum load direction.Certainly, also can the direction beyond the maximum load direction form the 2nd lubrication channel.

In the above-mentioned mode of execution,

lubrication channel

224K, 224L are formed on the eccentric shaft of the eccentric oscillating-type speed reducer that distributes type, but also can be applied in the eccentric oscillating-type speed reducer of centre-crank formula as shown in Figure 1.

In the above-mentioned mode of execution, to the lubricant oil that flows out from

lubrication channel

224K, 224L mainly be supplied to the 1st, the 2nd roller bearing 278,279 example is illustrated, but be not limited thereto, for example, can by forming radial slot etc. at the 1st, the 2nd stopper 232, the 234 and the 1st, the 2nd eccentric body 214,216 bearing surface someway, will also be supplied to the 1st, the 2nd eccentric body bearing 228,230 from the lubricant oil of

lubrication channel

224K, 224L outflow.

In the above-mentioned mode of execution, the 1st, the 2nd roller bearing 278,279 examples that are made of the roller that directly is connected to eccentric shaft 271 are described, but be not limited thereto, also can be consisted of by the bearing that possesses special-purpose inner ring.At this moment, by forming radial slot etc. at inner ring and the 1st, the 2nd stopper 232,234 bearing surface someway, will be supplied to rolling element from the lubricant oil that

lubrication channel

224K, 224L flow out and get final product.

Claims

1. eccentric oscillating-type speed reducer, it possesses external gear, with the internal gear of this external gear engagement, have the eccentric shaft that makes the eccentric body that described external gear swings and a wheel support body that supports this eccentric shaft by bearing, described eccentric oscillating-type speed reducer is characterised in that

Possess: the 1st lubrication channel forms vertically in described eccentric shaft, and lubricant oil is flowed into; The 2nd lubrication channel is communicated with described the 1st lubrication channel, and radially extends to form,

The 2nd lubrication channel is opening between described bearing and eccentric body.

2. eccentric oscillating-type speed reducer as claimed in claim 1 is characterized in that,

Described bearing is made of the roller with the direct butt of outer circumferential face of described eccentric shaft.

3. eccentric oscillating-type speed reducer as claimed in claim 1 or 2 is characterized in that,

Configuration eccentric body bearing between the periphery of described eccentric body and external gear,

Dispose stop component between described bearing and eccentric body, this stop component limits moving axially of described eccentric body bearing,

Be provided with the gap between the interior week of this stop component and the periphery of described eccentric shaft.

4. such as each described eccentric oscillating-type speed reducer in the claim 1～3, it is characterized in that possessing a plurality of described eccentric bodies and external gear,

The 2nd lubrication channel that also possesses opening between these a plurality of eccentric bodies.

5. such as each described eccentric oscillating-type speed reducer in the claim 1～4, it is characterized in that,

Described the 2nd lubrication channel separates the phase differences of 180 degree and at 2 place's openings, and consists of 1 continuous straight line shape passage.

6. such as each the described eccentric oscillating-type speed reducer in the claim 1～5, it is characterized in that,

The opening of described the 2nd lubrication channel is formed at maximum eccentric direction and the minimum eccentric direction of described eccentric body.

7. eccentric oscillating-type speed reducer as claimed in claim 6 is characterized in that,

The opening of described the 2nd lubrication channel is formed at respectively: maximum load direction and its opposition side when the maximum load direction during forward and its opposition side and counter-rotating.

8. such as each described eccentric oscillating-type speed reducer in the claim 1～7, it is characterized in that,

The radial direction medial extremity of the opening side of leaning on described the 2nd lubrication channel of the retainer of described bearing tilts from the state with parallel to an axis.