CN208804178U

CN208804178U - Coaxial speed reducer

Info

Publication number: CN208804178U
Application number: CN201821349941.6U
Authority: CN
Inventors: 曾卫林
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-08-21
Filing date: 2018-08-21
Publication date: 2019-04-30
Anticipated expiration: 2028-08-21

Abstract

The utility model relates to oil gas energy extraction equipment technical fields, it is a kind of coaxial speed reducer, including outer barrel assembly and deceleration transmission pipe string, being equipped in outer barrel assembly can be relative to the deceleration transmission pipe string that it is voluntarily rotated, and what formation can be connected to up and down between deceleration transmission pipe string and outer barrel assembly crosses liquid channel；The deceleration transmission pipe string includes the input shaft being from top to bottom sequentially distributed, universal drive shaft, gear shaft, ring gear and output shaft, input shaft and output shaft are coaxial distribution, the axis of gear shaft is not overlapped with the axis of input shaft in parallelly distribute on and the two, and the universal drive shaft for being able to achieve the transmitting of off-axis torque is sequentially connected between the lower end of input shaft and the upper end of gear shaft.The utility model makes input shaft realize the purpose of deceleration torque increase by the engaged transmission of gear shaft and ring gear as high speed shaft, so that output shaft is able to maintain low-speed big rotation, and output shaft can also keep rotating coaxially as slow-speed shaft with input shaft.

Description

Coaxial speed reducer

Technical field

The utility model relates to oil gas energy extraction equipment technical fields, are a kind of coaxial speed reducers.

Background technique

High speed mud motor such as turbodrill is widely used in oil drilling field.This drilling tool general work revolving speed Higher (typically larger than 1000r/min), suitably to meet field application, preferably performance power drilling tool performance usually can be with Selection installs retarder to reduce working speed, improves output torque.

Since operating condition needs, this kind of retarder needs to meet two most basic requirements: first, input, output shaft Coaxially.Second, input, output axle steer are consistent.In general, mud motor selection uses planetary reducer as deceleration Device type, and this kind of product has had a large amount of successful applications.According to the feature of planetary reducer, usual structure is in tooth The annular space of suit sun gear in circle, sun gear and gear ring is intracavitary to be circumferentially engaged with multiple planetary gears, multiple planetary gears It connects to form pinion frame at axis, in transmission process, generally be inputted using sun gear, gear ring is fixed, and pinion frame is defeated Scheme out.

It is with regard to the problem that the planetary reducer of the above-mentioned type faces: in slim-hole (such as less than 8.5in Well) in well, since maximum outside diameter limits, planetary reducer just seems that structure is relative complex.Complexity just shows planet Gear reduction unit is necessarily required to this few class basic part of sun gear, planetary gear, gear ring, planet carrier, complicated structure, more inside Part, so that retarder outer diameter is larger.To be difficult to realize be driven using large module gear, because with the increasing of modulus Add, in the case where transmission ratio is constant, it is meant that need bigger size, this forms sharp contradiction with slim-hole, it is difficult to It solves.On the contrary, in the case where transmission ratio is constant, if reducing module reduces retarder size, it is meant that reduce The flexural strength of gear, the gear to work in mud are easier to wear, and broken teeth, this is opposite with the mentality of designing of gear 's.

Therefore, suitable retarder is had no in small diameter borehole at present, and uses planetary reducer, then there is knot Structure is complicated, and design difficulty is not easy to realize greatly, and reliability is also difficult to be guaranteed.

Summary of the invention

The utility model provides a kind of coaxial speed reducer, overcomes the defects of the prior art, and can effectively solve Existing small diameter borehole has no suitable retarder, using planetary reducer again in the presence of structure is complicated, design difficulty, very much not It easily realizes, and reliability is also difficult to the problem of being guaranteed.

The technical solution of the utility model is realized by following measures: a kind of coaxial speed reducer, including outer cylinder are total At with deceleration transmission pipe string, the deceleration transmission pipe string that can voluntarily rotate relative to it, deceleration transmission pipe string are equipped in outer barrel assembly What formation can be connected to up and down between outer barrel assembly crosses liquid channel；The deceleration transmission pipe string includes from top to bottom being sequentially distributed Input shaft, universal drive shaft, gear shaft, ring gear and output shaft, input shaft, gear shaft and output shaft are mounted in outer cylinder In assembly, input shaft and output shaft are coaxial distribution, the axis of the axis of gear shaft and input shaft in parallelly distribute on and the two not It is overlapped, the universal drive shaft for being able to achieve the transmitting of off-axis torque is sequentially connected between the lower end of input shaft and the upper end of gear shaft, The lower part of gear shaft is equipped with outer gear portion, and the top of ring gear is equipped with inner gear portion, inner gear portion be located at outer gear portion outside and The two meshes together, and the lower part of ring gear is fixedly installed togather with the top of output shaft and the two is in coaxial distribution.

Here is the further optimization and/or improvements to above-mentioned utility model technical solution:

Bearing assembly can be had by setting between above-mentioned input shaft and outer barrel assembly, be set on the inside of the outer barrel assembly of corresponding gear shaft position There is eccentrically mounted channel up and down, gear shaft is located in eccentrically mounted channel and being equipped with can make the two keep phase between the two To the bearing assembly of smooth pivotal, bearing assembly is equipped between output shaft and outer barrel assembly；The bearing assembly is annular in shape, is located at Associated member on the inside of bearing assembly is known as inner part, and the associated member on the outside of bearing is known as exterior part, the bearing group Part can form axial limiting to inner part, and the bearing assembly can make inner part opposite outer part smooth pivotal.

Fluid through-hole of crossing up and down can be equipped on the inside of above-mentioned outer barrel assembly, the centre bore of ring gear connects with fluid through-hole is crossed Logical, the lower inside of ring gear and the upper outside of output shaft are fixedly installed togather, and the middle part of output shaft is equipped with up and down Communicating passage, communicating passage is connected to the centre bore of ring gear；Corresponding input shaft and eccentric peace turn ten thousand of position between channel To annular space sap cavity is formed between transmission shaft and outer barrel assembly, annular space sap cavity is connected to fluid through-hole is crossed, and the middle part of input shaft, which is equipped with, opens The intercommunicating pore being connected to blind vias is distributed in the upward blind vias of mouth, the lower part of input shaft, and intercommunicating pore is connected to annular space sap cavity, blind Channel, intercommunicating pore, annular space sap cavity, cross the formation that fluid through-hole, ring gear centre bore and communicating passage be connected tos up and down jointly liquid lead to Road.

Above-mentioned outer barrel assembly may include the first outer cylinder, the second outer cylinder, third outer cylinder being from top to bottom connected in turn With the 4th outer cylinder, the upper outside of the lower inside of the first outer cylinder and the second outer cylinder is fixedly installed togather and can pass between the two Torque delivery, the lower outside of the second outer cylinder and the upper inner of third outer cylinder are fixedly installed togather and can transmit torsion between the two The upper inner of square, the lower outside of third outer cylinder and the 4th outer cylinder is fixedly installed togather and can transmit torque between the two； The middle part of input shaft is located at the upper inner of the first outer cylinder and is equipped with bearing assembly, the lower part of input shaft and gear shaft between the two Top be respectively positioned in the second outer cylinder, eccentrically mounted channel is located on the inside of third outer cylinder, the of corresponding eccentrically mounted channel position Fluid through-hole, the outer gear portion excessively being equipped on the inside of three outer cylinders up and down are located at the upper inner of the 4th outer cylinder, the middle part of output shaft In the 4th outer cylinder and between the two equipped with bearing assembly.

Can be connected through a screw thread between above-mentioned first outer cylinder and the second outer cylinder be fixedly installed togather and junction be equipped with it is close Seal circumferentially has at least two anti-rotation members between the first outer cylinder and the second outer cylinder；Second outer cylinder and third outer cylinder it Between be connected through a screw thread be fixedly installed togather and junction be equipped with sealing ring, circumferentially divide between the second outer cylinder and third outer cylinder It is furnished at least two anti-rotation members；It is connected through a screw thread and is fixedly installed togather and junction between third outer cylinder and the 4th outer cylinder Equipped with sealing ring, circumferentially there are at least two anti-rotation members between third outer cylinder and the 4th outer cylinder.

The upper outside of above-mentioned first outer cylinder, which can be fixedly installed with, connects outer cylinder, and the lower outside of the 4th outer cylinder is fixedly mounted Outer cylinder is connect under having, the lower part that outer cylinder is connect under described can be connected through a screw thread with the top for above connecing outer cylinder be fixedly installed togather and Between the two can circumferentially at least two anti-rotation member, the lower end of output shaft be fixedly installed with it is double connect shaft coupling, it is described double Torque can be transmitted with the limit installation of the upper end of input shaft together and between the two by connecing shaft coupling.

Above-mentioned bearing assembly may include upper bearing (metal), axle sleeve and lower bearing, and upper bearing (metal) and lower bearing are spaced along the vertical direction to be divided Be distributed between inner part and exterior part, be equipped between upper bearing (metal) and lower bearing and be set in axle sleeve on the outside of inner part, axle sleeve it is upper Lower both ends are contacted with the corresponding end surface of upper bearing (metal) and lower bearing respectively；Upper bearing (metal) and lower bearing include outer ring body, roller and interior Circle body is equipped with roller, is equipped on the inside of the exterior part of corresponding upper bearing (metal) outer ring body upper side position between the outer ring body and inner ring body Land in first, the exterior part inside of corresponding lower bearing outer ring body lower position are equipped with land in second, corresponding upper bearing (metal) inner ring It is equipped with the first outer land on the outside of the inner part of body upper side position, is equipped on the outside of the inner part of corresponding lower bearing outer ring body lower position Second outer land, the outer ring housing of lower bearing is in second in land, and the first outer ring pedestal is on the inner ring body of upper bearing (metal).

Above-mentioned universal drive shaft may include the first transmission shaft, second driving shaft, third transmission shaft and Hooks coupling universal coupling, first The lower end of transmission shaft and the upper end of second driving shaft are sequentially connected together by Hooks coupling universal coupling, the lower end of second driving shaft with The upper end of third transmission shaft is sequentially connected together by Hooks coupling universal coupling, and the top of the first transmission shaft and the lower part of input shaft pass Dynamic to link together and the two coaxially transmit torque, the lower part of third transmission shaft links together in the upper transmission of gear shaft And the two can coaxially transmit torque.

The lower inside of above-mentioned ring gear and the upper outside of output shaft can be connected through a screw thread be fixedly installed togather and The junction of the two is circumferentially equipped with anti-rotation nail；The lower outside of input shaft and the upper inner of universal drive shaft are connected by key Connect transmission connection together, the lower inside of universal drive shaft and the upper outside of gear shaft are connected by key transmission connection one It rises.

The utility model reasonable and compact in structure makes input shaft as high speed shaft, passes through nibbling for gear shaft and ring gear Transmission is closed, the coaxial speed reducer solved in underground work uses large module gear driven Design difficult in limited wellbore space Big problem is spent, the purpose of deceleration torque increase is realized, so that output shaft is able to maintain low-speed big rotation, and output shaft is as low Fast axis can also keep rotating coaxially with input shaft；The formation for crossing liquid channel can ensure that the liquid communication of underground work, meet underground The duty requirements of operation；It only passes through gear shaft and step-down ratio can be realized in ring gear engagement, with existing planetary gear Retarder is compared, it is clear that substantially reduced outside diameter size is understood, although will lead to axial dimension (overall length due to increasing universal drive shaft Degree) increase, however for downhole tool, radial dimension is most valuable since borehole size limits, and to axial ruler Very little increase is insensitive, so that the utility model can be suitably used for small diameter borehole operation；Due in the utility model and being free of There is the necessary part of the existing planetary reducer such as planetary gear, planet carrier, its structure can be made relatively more compact, it is easier to Meet design requirement under slim-hole operating condition；Since its engaged transmission number of packages amount is few, it can also make it easy to process and assemble, and energy The enough stability for improving transmission, can be in the case where not reducing transmission ratio, it is easier to use large module gear；In addition, working as The deceleration transmission of actual demand is bigger, and when borehole diameter is smaller, it can realize that multistages subtract by multiple the utility model of connecting Speed transmission, and then meet the deceleration transmission of slim-hole large transmission ratio, it selects flexibly, there is good applicability.

Detailed description of the invention

Attached drawing 1 is schematic diagram of main cross-sectional structure of the best embodiment of the utility model.

Coding in attached drawing is respectively as follows: 1 for input shaft, and 2 be gear shaft, and 3 be ring gear, and 4 be output shaft, and 5 be external gear Portion, 6 be inner gear portion, and 7 be eccentrically mounted channel, and 8 be fluid through-hole, and 9 be communicating passage, and 10 be annular space sap cavity, and 11 be blind logical Road, 12 be intercommunicating pore, and 13 be the first outer cylinder, and 14 be the second outer cylinder, and 15 be third outer cylinder, and 16 be the 4th outer cylinder, and 17 be sealing ring, 18 be anti-rotation member, and 19 is above connect outer cylinder, 20 be under connect outer cylinder, 21 connect shaft coupling to be double, and 22 be upper bearing (metal), and 23 be axle sleeve, 24 It is land in first for lower bearing, 25,26 be land in second, and 27 be the first outer land, and 28 be the second outer land, and 29 be first Transmission shaft, 30 be second driving shaft, and 31 be third transmission shaft, and 32 be Hooks coupling universal coupling, and 33 be anti-rotation nail.

Specific embodiment

The utility model is not limited by following embodiments, can technical solution according to the present utility model and actual conditions Determine specific embodiment.

In the present invention, for ease of description, the description of the relative positional relationship of each component is according to specification The Butut mode of attached drawing 1 is described, such as: front, rear, top, and bottom, left and right positional relationship be according to Figure of description Butut direction determine.

The utility model is further described below with reference to examples and drawings:

As shown in Fig. 1, which includes outer barrel assembly and deceleration transmission pipe string, and energy is equipped in outer barrel assembly The deceleration transmission pipe string voluntarily rotated relative to it, the liquid of crossing that formed between deceleration transmission pipe string and outer barrel assembly to be connected to up and down lead to Road；The deceleration transmission pipe string includes the input shaft 1 being from top to bottom sequentially distributed, universal drive shaft, gear shaft 2,3 and of ring gear Output shaft 4, input shaft 1, gear shaft 2 and output shaft 4 are mounted in outer barrel assembly, and input shaft 1 and output shaft 4 are coaxial The axis of distribution, gear shaft 2 is not overlapped with the axis of input shaft 1 in parallelly distribute on and the two, the lower end of input shaft 1 and gear shaft The universal drive shaft for being able to achieve the transmitting of off-axis torque is sequentially connected between 2 upper end, the lower part of gear shaft 2 is equipped with outer gear portion 5, the top of ring gear 3 is equipped with inner gear portion 6, and inner gear portion 6 is located at 5 outside of outer gear portion and the two meshes together, internal tooth The lower part of circle 3 and the top of output shaft 4 are fixedly installed togather and the two is in coaxial distribution.It, will be originally practical new in use process Type connects in access tube string, and the predeterminated position in tripping in well, thus can drive input shaft 1, passes through universal drive shaft band movable tooth Wheel shaft 2 rotates, can be convenient for the setting in outer barrel assembly and the formation of gear shaft 2 since gear shaft 2 and input shaft 1 are in decentered distribution Thus the ring gear 3 of step-down ratio can drive ring gear 3 to rotate by gear shaft 2, and then so that output shaft 4 is formed deceleration and turn Dynamic, the coaxial speed-down for realizing input shaft 1 to output shaft 4 is driven；The utility model reasonable and compact in structure makees input shaft 1 Solves the coaxial speed reducer in underground work limited by the engaged transmission of gear shaft 2 and ring gear 3 for high speed shaft Using the problem that large module gear driven Design difficulty is big in wellbore space, the purpose of deceleration torque increase is realized, so that output shaft 4 It is able to maintain low-speed big rotation, and output shaft 4 can also keep rotating coaxially as slow-speed shaft with input shaft 1；Cross liquid channel The liquid communication that can ensure that underground work is formed, the duty requirements of underground work are met；It only passes through gear shaft 2 and ring gear 3 Step-down ratio can be realized in engagement, compared with existing planetary reducer, it is clear that understand substantially reduced outside diameter size, although It will lead to axial dimension (overall length) increase due to increasing universal drive shaft, however for downhole tool, radial dimension Since borehole size limitation is most valuable, and it is insensitive to axial dimension increase, so that the utility model can be applicable in In small diameter borehole operation；Due in the utility model and without containing existing planetary reducers such as planetary gear, planet carriers Necessary part, its structure can be made relatively more compact, it is easier to meet design requirement under slim-hole operating condition；Due to its engagement Driving member quantity is few, can also make it easy to process and assemble, and can be improved the stability of transmission, can not reduce transmission Than in the case where, it is easier to use large module gear；In addition, when actual demand deceleration transmission it is bigger, and borehole diameter compared with Hour, multi-stage speed-reducing transmission can be realized by multiple the utility model of connecting, and then the deceleration for meeting slim-hole large transmission ratio passes It is dynamic, it selects flexibly, there is good applicability.According to demand, outer gear portion 5 and gear shaft 2 can be wholely set or be fixed on one It rises, inner gear portion 6 can be wholely set or be fixed together in ring gear 3.

Above-mentioned coaxial speed reducer can be made further optimization and/or improvements according to actual needs:

As shown in Fig. 1, bearing assembly is equipped between input shaft 1 and outer barrel assembly, the outer cylinder of 2 position of corresponding teeth wheel shaft is total It is equipped with eccentrically mounted channel 7 up and down inside, gear shaft 2 is located in eccentrically mounted channel 7 and is equipped with energy between the two So that the two is kept the bearing assembly of relative smooth rotation, bearing assembly is equipped between output shaft 4 and outer barrel assembly；The bearing group Part is annular in shape, and the associated member on the inside of bearing assembly is known as inner part, and the associated member on the outside of bearing is known as external Part, the bearing assembly can form axial limiting to inner part, and the bearing assembly can make inner part opposite outer part smooth Rotation.Thus input shaft 1, gear shaft 2 and output shaft 4 can be made to form the inner part of corresponding shaft bearing component, the correspondence of outer barrel assembly Position forms the exterior part of bearing assembly, is achieved in inner part opposite outer part energy smooth pivotal, realizes torque transmitting, and subtract Few energy loss, improves transmission efficiency.According to demand, existing well-known technique can be used in the bearing assembly, with can be to inner part Suspension limit is formed, and inner part opposite outer part smooth pivotal can be made to be limited.

As shown in Fig. 1, fluid through-hole excessively up and down is equipped on the inside of the outer barrel assembly of eccentrically mounted 7 position of channel of correspondence 8, the centre bore of ring gear 3 is connected to fluid through-hole 8 is crossed, and the lower inside of ring gear 3 and the upper outside of output shaft 4 are fixedly mounted Together, the middle part of output shaft 4 is equipped with communicating passage 9 up and down, and communicating passage 9 is connected to the centre bore of ring gear 3；It is right Input shaft 1 and eccentric peace is answered to turn to form annular space sap cavity 10, annular space between channel between the universal drive shaft and outer barrel assembly of position Sap cavity 10 is connected to fluid through-hole 8 is crossed, and the middle part of input shaft 1 is equipped with the blind vias 11 of opening upwards, and the lower part of input shaft 1 is distributed with The intercommunicating pore 12 being connected to blind vias 11, intercommunicating pore 12 are connected to annular space sap cavity 10, blind vias 11, intercommunicating pore 12, annular space sap cavity 10, fluid through-hole 8,3 centre bore of ring gear and the common formation being connected to up and down of communicating passage 9 liquid channel are crossed.Thus can pass through Liquid channel meets the liquid communication demand of underground work.According to demand, the top of input shaft 1 can be distributed with is connected to blind vias 11 Liquid injection hole 34, due to input shaft 1 upper end would generally with conventionally known Power Available Shaft be sequentially connected together, such as use Shaft coupling connection etc., therefore liquid injection hole 34, which is arranged, can make high-pressure fluid after entering in the utility model, it can be from liquid injection hole 34 Into in liquid channel, so as to pass through the liquid communication demand that liquid channel meets underground work；Liquid injection hole 34 or/and excessively liquid The quantity of through-hole 8 can be one or more, be limited with being able to satisfy down-hole liquid circulation demand.

As shown in Fig. 1, outer barrel assembly includes the first outer cylinder 13, the second outer cylinder being from top to bottom connected in turn 14, the upper outside of third outer cylinder 15 and the 4th outer cylinder 16, the lower inside of the first outer cylinder 13 and the second outer cylinder 14 is fixedly mounted Torque can be transmitted together and between the two, and the lower outside of the second outer cylinder 14 and the upper inner of third outer cylinder 15 are fixedly mounted Torque, the upper inner fixed installation of the lower outside of third outer cylinder 15 and the 4th outer cylinder 16 can be transmitted together and between the two Torque can be transmitted together and between the two；The middle part of input shaft 1 is located at the upper inner of the first outer cylinder 13 and sets between the two There is bearing assembly, the lower part of input shaft 1 and the top of gear shaft 2 are respectively positioned in the second outer cylinder 14, and eccentrically mounted channel 7 is located at the On the inside of three outer cylinder 15, fluid through-hole 8 excessively up and down is equipped on the inside of the third outer cylinder 15 of eccentrically mounted 7 position of channel of correspondence, outside Gear part 5 is located at the upper inner of the 4th outer cylinder 16, and the middle part of output shaft 4 is located in the 4th outer cylinder 16 and is equipped with axis between the two Bearing assembly.Thus it can be convenient for the processing and assembly of all parts, reduce production cost, improve assembly efficiency.

As shown in Fig. 1, it is connected through a screw thread between the first outer cylinder 13 and the second outer cylinder 14 and is fixedly installed togather and connects It meets place and is equipped with sealing ring 17, circumferentially there is at least two anti-rotation members 18 between the first outer cylinder 13 and the second outer cylinder 14；The It is connected through a screw thread and is fixedly installed togather and junction is equipped with sealing ring 17 between two outer cylinders 14 and third outer cylinder 15, outside second Circumferentially there are at least two anti-rotation members 18 between cylinder 14 and third outer cylinder 15；Between third outer cylinder 15 and the 4th outer cylinder 16 Be connected through a screw thread be fixedly installed togather and junction be equipped with sealing ring 17, along circle between third outer cylinder 15 and the 4th outer cylinder 16 At least two anti-rotation members 18 are distributed with week.Thus it can be connected through a screw thread and realize consolidating for two components with anti-rotation member 18 Dingan County's dress, it is easy to process, it is easily installed, and can ensure that and can transmit torque between relevant two components.According to demand, outside first Cylinder 13 and the second torque transmitting connection between outer cylinder 14, the second outer cylinder 14 with before third outer cylinder 15 torque transmitting connection and Other existing well-known techniques also can be used in torque transmitting connection between third outer cylinder 15 and the 4th outer cylinder 16, to ensure the two Between be able to maintain and be fixedly connected with and can transmit torque and be limited；Existing well-known technique can be used in anti-rotation member 18, such as antirotation keys or anti-rotation Nail 33 etc.；Existing public affairs can be used for one or more, sealing ring 17 in the quantity setting of the sealing ring 17 of every two component junction Know technology, such as O-ring.

As shown in Fig. 1, the upper outside of the first outer cylinder 13, which is fixedly installed with, connects outer cylinder 19, the lower part of the 4th outer cylinder 16 Outside, which is fixedly installed with down, connects outer cylinder 20, and the lower part that outer cylinder 20 is connect under described can be connected with the top for above connecing outer cylinder 19 by screw thread It connects and is fixedly installed togather and circumferentially can fix peace at least two anti-rotation members 18, the lower end of output shaft 4 between the two Shaft coupling 21 is connect equipped with double, double shaft couplings 21 that connect can be mounted together with the upper end of input shaft 1 and between the two can Enough transmit torque.Thus multi-stage speed-reducing transmission can be realized convenient for multiple the utility model are cascaded；When multiple it is practical When novel series connection, connect under the utility model being located above outer cylinder 20 lower part and this reality adjacent thereto and be disposed below Being fixedly connected of both realizing can be together by a threaded connection with the top for connecing outer cylinder 19 on novel, it between the two can be along circle At least two anti-rotation members 18 are distributed with week to ensure that torque can be transmitted between the two；Pair of the utility model being located above The lower part and the top of the input shaft 1 of the utility model that is adjacent thereto and being disposed below for connecing shaft coupling 21 can be installed in Torque can be transmitted together and between the two.According to demand, existing well-known technique can be used in double shaft couplings 21 that connect, as spline is rigid Property shaft coupling etc..

As shown in Fig. 1, bearing assembly includes upper bearing (metal) 22, axle sleeve 23 and lower bearing 24, upper bearing (metal) 22 and lower bearing 24 It is spaced apart between inner part and exterior part along the vertical direction, is equipped between upper bearing (metal) 22 and lower bearing 24 and is set in inner part The axle sleeve 23 in outside, the upper and lower ends of axle sleeve 23 are contacted with the corresponding end surface of upper bearing (metal) 22 and lower bearing 24 respectively；Upper bearing (metal) 22 Include outer ring body, roller and inner ring body with lower bearing 24, roller, corresponding upper bearing (metal) are equipped between the outer ring body and inner ring body Land 25 in first, the outside of corresponding 24 outer ring body lower position of lower bearing are equipped on the inside of the exterior part of 22 outer ring body upper side positions It is equipped with land 26 in second on the inside of part, is equipped with the first outer land on the outside of the inner part of corresponding 22 inner ring body upper side position of upper bearing (metal) 27, the inner part outside of corresponding 24 outer ring body lower position of lower bearing is equipped with the second outer land 28, the outer ring housing of lower bearing 24 In second in land 26, the first outer land 27 is on the inner ring body of upper bearing (metal) 22.Thus it can pass through land 25, in first The setting of land 26 can form axial limiting to bearing assembly in two, and then be made by the first outer land 27 and the second outer land 28 It obtains bearing assembly and axial limiting is formed to inner part, may make inner part opposite by the setting of upper bearing (metal) 22 and lower bearing 24 Exterior part smooth pivotal.According to demand, land 26 can be fixedly installed togather with exterior part in land 25 and second in first, It is such as connected through a screw thread or is installed by fastener, can there is one and outer in first in land 25 and second in 26 the two of land Component is integrated setting, thus can simplify assembly process, improves assembly precision and efficiency；First outer land 27 and the second outer land 28 can be fixedly installed togather with inner part, such as are connected through a screw thread or are installed by fastener, the first outer 27 He of land Can there are one and inner part to be integrated setting in second outer 28 the two of land, thus can simplify assembly process, improve assembly precision With efficiency；Upper bearing (metal) 22 and lower bearing 24 can be existing known bearing, such as radial thrust bearing, when upper bearing (metal) 22 and lower axle When holding 24 and being radial thrust bearing, the two can be installation face-to-face or installation back-to-back；Upper bearing (metal) in every group of bearing assembly 22 and lower bearing 24 can in other bearing assemblies upper bearing (metal) 22 and lower bearing 24 it is identical, can also be different, when its part or When all identical, good versatility can be made it have.

As shown in Fig. 1, universal drive shaft includes the first transmission shaft 29, second driving shaft 30, third transmission shaft 31 and ten thousand To shaft coupling 32, the lower end of the first transmission shaft 29 and the upper end of second driving shaft 30 are sequentially connected by Hooks coupling universal coupling 32 one It rises, the lower end of second driving shaft 30 and the upper end of third transmission shaft 31 are sequentially connected together by Hooks coupling universal coupling 32, and first The top of transmission shaft 29 and the transmission connection of the lower part of input shaft 1 are together and the two can coaxially transmit torque, third transmission shaft 31 Lower part link together in the upper transmission of gear shaft 2 and the two can coaxially transmit torque.Thus it can pass through universal drive shaft Realize that the torque to input shaft 1 and gear shaft 2 under not coaxial state transmits.According to demand, Hooks coupling universal coupling 32 can be used existing There is well-known technique, such as universal coupling with spider, ball twist formula Hooks coupling universal coupling, shed stick formula Hooks coupling universal coupling；Universal drive Other existing well-known techniques also can be used in axis.

As shown in Fig. 1, the lower inside of ring gear 3 and the upper outside of output shaft 4 are connected through a screw thread fixed installation Together and the junction of the two is circumferentially equipped with anti-rotation nail 33；The lower outside of input shaft 1 and the top of universal drive shaft Inside is connected by key transmission connection together, and the lower inside of universal drive shaft and the upper outside of gear shaft 2 are connected by key Connect transmission connection together.Thus it can ensure that each associated member in deceleration transmission pipe string is able to achieve torque transmitting, and can be just In its processing and installation, assembly precision is reduced, improves assembly efficiency.According to demand, other existing public affairs also can be used in anti-rotation nail 33 Know rotation preventing device as equivalence replacement, such as stop pin, antirotation keys.

The above technical characteristic constitutes the most preferred embodiment of the utility model, with stronger adaptability and best implementation Effect can increase and decrease non-essential technical characteristic, according to actual needs to meet the needs of different situations.

Claims

1. a kind of coaxial speed reducer, it is characterised in that including outer barrel assembly and deceleration transmission pipe string, energy is equipped in outer barrel assembly The deceleration transmission pipe string voluntarily rotated relative to it, the liquid of crossing that formed between deceleration transmission pipe string and outer barrel assembly to be connected to up and down lead to Road；The deceleration transmission pipe string includes the input shaft being from top to bottom sequentially distributed, universal drive shaft, gear shaft, ring gear and defeated Shaft, input shaft, gear shaft and output shaft are mounted in outer barrel assembly, and input shaft and output shaft are coaxial distribution, tooth The axis of wheel shaft is not overlapped with the axis of input shaft in parallelly distribute on and the two, between the lower end of input shaft and the upper end of gear shaft Be sequentially connected with the universal drive shaft for being able to achieve the transmitting of off-axis torque, the lower part of gear shaft is equipped with outer gear portion, ring gear it is upper Portion is equipped with inner gear portion, and inner gear portion is located on the outside of outer gear portion and the two meshes together, the lower part of ring gear and output shaft Top be fixedly installed togather and the two is in coaxial distribution.

2. coaxial speed reducer according to claim 1, it is characterised in that be equipped with bearing group between input shaft and outer barrel assembly The outer barrel assembly inside of part, corresponding gear shaft position is equipped with eccentrically mounted channel up and down, and gear shaft is located at eccentrically mounted It is equipped in channel and between the two the bearing assembly that the two can be made to keep relative smooth rotation, is set between output shaft and outer barrel assembly There is bearing assembly；The bearing assembly is annular in shape, and the associated member on the inside of bearing assembly is known as inner part, is located at outside bearing The associated member of side is known as exterior part, and the bearing assembly can form axial limiting to inner part, and the bearing assembly can make Inner part opposite outer part smooth pivotal.

3. coaxial speed reducer according to claim 2, it is characterised in that be equipped with liquid excessively up and down on the inside of outer barrel assembly Through-hole, the centre bore of ring gear are connected to fluid through-hole is crossed, and the lower inside of ring gear and the upper outside of output shaft are fixedly mounted Together, the middle part of output shaft is equipped with communicating passage up and down, and communicating passage is connected to the centre bore of ring gear；Correspondence is defeated Enter axis and eccentric peace turns to form annular space sap cavity, annular space sap cavity and mistake between channel between the universal drive shaft and outer barrel assembly of position Fluid through-hole connection, the middle part of input shaft be equipped with the blind vias of opening upwards, and the lower part of input shaft is distributed with to be connected to blind vias Intercommunicating pore, intercommunicating pore are connected to annular space sap cavity, and blind vias, annular space sap cavity, crosses fluid through-hole, ring gear centre bore and company at intercommunicating pore Circulation passage jointly up and down be connected to formation liquid channel.

4. coaxial speed reducer according to claim 3, it is characterised in that outer barrel assembly includes from top to bottom being connected in turn The first outer cylinder, the second outer cylinder, third outer cylinder and the 4th outer cylinder together, the top of the lower inside of the first outer cylinder and the second outer cylinder Outside is fixedly installed togather and can transmit torque, the lower outside of the second outer cylinder and the upper inner of third outer cylinder between the two It is fixedly installed togather and torque can be transmitted between the two, the lower outside of third outer cylinder and the upper inner of the 4th outer cylinder are fixed It is installed together and torque can be transmitted between the two；The middle part of input shaft is located at the upper inner of the first outer cylinder and sets between the two There is bearing assembly, the lower part of input shaft and the top of gear shaft are respectively positioned in the second outer cylinder, and eccentrically mounted channel is located at outside third Cylinder inside, be equipped on the inside of the third outer cylinder of corresponding eccentrically mounted channel position up and down cross fluid through-hole, outer gear portion is located at The upper inner of 4th outer cylinder, the middle part of output shaft are located in the 4th outer cylinder and are equipped with bearing assembly between the two.

5. coaxial speed reducer according to claim 4, it is characterised in that pass through screw thread between the first outer cylinder and the second outer cylinder Be connected and fixed be installed together and junction be equipped with sealing ring, circumferentially have at least two between the first outer cylinder and the second outer cylinder A anti-rotation member；Be connected through a screw thread between second outer cylinder and third outer cylinder be fixedly installed togather and junction be equipped with sealing Circle, circumferentially there is at least two anti-rotation members between the second outer cylinder and third outer cylinder；Between third outer cylinder and the 4th outer cylinder Be connected through a screw thread be fixedly installed togather and junction be equipped with sealing ring, between third outer cylinder and the 4th outer cylinder circumferentially There are at least two anti-rotation members.

6. coaxial speed reducer according to claim 4 or 5, it is characterised in that the upper outside of the first outer cylinder is fixedly installed with On connect outer cylinder, the lower outside of the 4th outer cylinder, which is fixedly installed with down, connects outer cylinder, connect under described outer cylinder lower part can with above connect it is outer The top of cylinder be connected through a screw thread be fixedly installed togather and between the two can circumferentially at least two anti-rotation member, output The lower end of axis be fixedly installed with it is double connect shaft coupling, double shaft couplings that connect can be mounted together and two with the upper end of input shaft Torque can be transmitted between person.

7. according to coaxial speed reducer described in Claims 2 or 3 or 4 or 5, it is characterised in that bearing assembly includes upper bearing (metal), axis Set and lower bearing, upper bearing (metal) and lower bearing are spaced apart along the vertical direction between inner part and exterior part, upper bearing (metal) and lower axle It is equipped between holding and is set in axle sleeve on the outside of inner part, the upper and lower ends of the axle sleeve corresponding end surface with upper bearing (metal) and lower bearing respectively Contact；Upper bearing (metal) and lower bearing include outer ring body, roller and inner ring body, and roller is equipped between the outer ring body and inner ring body, Land in first is equipped on the inside of the exterior part of corresponding upper bearing (metal) outer ring body upper side position, corresponding lower bearing outer ring body lower position It is equipped with land in second on the inside of exterior part, is equipped with the first outer land on the outside of the inner part of corresponding upper bearing (metal) inner ring body upper side position, It is equipped with the second outer land on the outside of the inner part of corresponding lower bearing outer ring body lower position, the outer ring housing of lower bearing is in the second inner ring On platform, the first outer ring pedestal is on the inner ring body of upper bearing (metal).

8. coaxial speed reducer according to claim 6, it is characterised in that bearing assembly includes upper bearing (metal), axle sleeve and lower axle It holds, upper bearing (metal) and lower bearing are spaced apart along the vertical direction between inner part and exterior part, are set between upper bearing (metal) and lower bearing There is the axle sleeve being set on the outside of inner part, the upper and lower ends of axle sleeve are contacted with the corresponding end surface of upper bearing (metal) and lower bearing respectively；On Bearing and lower bearing include outer ring body, roller and inner ring body, and roller, axis in correspondence are equipped between the outer ring body and inner ring body Land in first is equipped on the inside of the exterior part of bearing outer-ring body upper side position, in the exterior part for corresponding to lower bearing outer ring body lower position Side is equipped with land in second, and the first outer land, corresponding lower axle are equipped on the outside of the inner part of corresponding upper bearing (metal) inner ring body upper side position It is equipped with the second outer land on the outside of the inner part of bearing outer-ring body lower position, the outer ring housing of lower bearing is in second in land, and the One outer ring pedestal is on the inner ring body of upper bearing (metal).

9. coaxial speed reducer described according to claim 1 or 2 or 3 or 4 or 5 or 8, it is characterised in that universal drive shaft includes the One transmission shaft, second driving shaft, third transmission shaft and Hooks coupling universal coupling, the lower end of the first transmission shaft and the upper end of second driving shaft Together by Hooks coupling universal coupling transmission connection, the lower end of second driving shaft and the upper end of third transmission shaft pass through Hooks coupling universal coupling Together, the lower part transmission connection of the top of the first transmission shaft and input shaft is together and the two can coaxially transmit torsion for transmission connection The lower part of square, third transmission shaft links together in the upper transmission of gear shaft and the two can coaxially transmit torque.

10. coaxial speed reducer described according to claim 1 or 2 or 3 or 4 or 5 or 8, it is characterised in that in the lower part of ring gear The upper outside of side and output shaft, which is connected through a screw thread, to be fixedly installed togather and the junction of the two is circumferentially equipped with anti-rotation Nail；The lower outside of input shaft and the upper inner of universal drive shaft are connected by key transmission connection together, universal drive shaft Lower inside and gear shaft upper outside be connected by key transmission connection together.