CN102678843A - Gear transmission - Google Patents
Gear transmission Download PDFInfo
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- CN102678843A CN102678843A CN2012101832735A CN201210183273A CN102678843A CN 102678843 A CN102678843 A CN 102678843A CN 2012101832735 A CN2012101832735 A CN 2012101832735A CN 201210183273 A CN201210183273 A CN 201210183273A CN 102678843 A CN102678843 A CN 102678843A
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Abstract
The invention discloses a gear transmission. Three middle shafts are arranged in parallel between an input shaft and an output shaft, wherein the first middle shaft, the second middle shaft and the third middle shaft are arranged in turn from top to bottom; a first middle gear is mounted on the first middle shaft; a second middle gear is mounted on the second middle shaft; a third middle gear is mounted on the third middle shaft; all the middle gears can rotate on the respective middle shafts; and the first, second and third middle shafts can move forwards and backwards under the action of an external force, so that the middle gears on the middle shafts can engage with the corresponding input gear and output gear. Different from the gear shift realized by utilizing the axial sliding of a gear shaft of a traditional structure, the gear shift is finished by the gear transmission by radially moving the gears and smartly utilizing a linear velocity difference between the different gears, and the defects of the traditional structure that the transmission is stopped and even gear teeth are broken during meshing because the linear velocity difference exists between different gears are effectively overcome.
Description
Technical field
The invention belongs to the gear transmission field, specifically, relate in particular to a kind of gear shift.
Background technique
As everyone knows, existing gear shift generally comprises at least two axles that are arranged side by side, and on each root axle, be set with the gear that many groups cooperatively interact, and gear is realized gearshift and speed change through gear axial slip on axle.In shift process, when the interlocks simultaneously of two groups of gears on the same axis, because the linear velocity of each interlock gear is different, the phenomenon that transmission stops even biting broken teeth will occur like this, and gear shift operation is complicated.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of gear shift of realizing gearshift that moves radially through gear.
Technological scheme of the present invention is following: a kind of gear shift; In gearbox (1), vertically be provided with input shaft (2) and output shaft (3); The upper and lower end of these two axles passes through bearings respectively on gearbox (1); On input shaft (2), be with first, second and third input gear (4,5,6) from top to bottom successively; And the diameter of first, second and third input gear increases successively; Said output shaft (3) is gone up should first, second and third output gear (7,8,9) being housed first, second and third input geared sleeve, it is characterized in that: between said input shaft (2) and output shaft (3), be arranged side by side three jack shafts, be followed successively by first, second and third jack shaft (10,11,12) from top to bottom; This first, second and third jack shaft is vertical with said input shaft (2), and insert in the mounting hole corresponding on the preceding casing of said gearbox (1) respectively the front portion of first, second and third jack shaft; On said first jack shaft (10), be equipped with and first input, output gear (4,7) first intermediate gear (13) of combo mutually; Be equipped with on second jack shaft (11) and said second input, output gear (5,8) second intermediate gear (14) of combo mutually, and be equipped with on the 3rd jack shaft (12) and said the 3rd input, output gear (6,9) the 3rd intermediate gear (15) of combo mutually; The center line of said first, second and third intermediate gear (13,14,15) all parallels with the shaft axis of said input shaft (2); Each intermediate gear can rotate on jack shaft separately; And first, second and third jack shaft (10,11,12) can forward and backwardly move under the effect of external force, and then makes intermediate gear and corresponding input gear and output gear engagement on each jack shaft.
The present invention is on the basis of conventional construction; Between said input shaft (2) and output shaft (3), set up three jack shafts that are arranged side by side; Be followed successively by first, second and third jack shaft (10,11,12) from top to bottom; This first, second and third jack shaft is vertical with said input shaft (2), and insert in the mounting hole corresponding on the preceding casing of said gearbox (1) respectively the front portion of first, second and third jack shaft; On said first jack shaft (10), be equipped with and first input, output gear (4,7) first intermediate gear (13) of combo mutually; Be equipped with on second jack shaft (11) and said second input, output gear (5,8) second intermediate gear (14) of combo mutually, and be equipped with on the 3rd jack shaft (12) and said the 3rd input, output gear (6,9) the 3rd intermediate gear (15) of combo mutually; The center line of said first, second and third intermediate gear (13,14,15) all parallels with the shaft axis of said input shaft (2); Each intermediate gear can rotate on jack shaft separately; And first, second and third jack shaft (10,11,12) can forward and backwardly move under the effect of external force, and then makes intermediate gear and corresponding input gear and output gear engagement on each jack shaft.
By on can know that above-mentioned first input gear (4), first intermediate gear (13) constitutes a gear train with first output gear (7), the gear of this gear train correspondence is a retaining; The above-mentioned second input gear (5), second intermediate gear (14) and second output gear (8) constitute a gear train, and the gear that this gear train is corresponding is two retainings; Above-mentioned the 3rd input gear (6), the 3rd intermediate gear (15) and the 3rd output gear (9) constitute a gear train, and the gear that this gear train is corresponding is three retainings.Certainly; The present invention is not limited to above-mentioned three gears; We can also can be provided with several transmission shafts, thereby realize the gear more than three at the gear that is set with on input shaft and the output shaft more than 3 again between input shaft and output shaft in practice.In addition, because the diameter of first, second and third input gear increases successively, the output speed of one, two, three retainings is increased successively in the present invention.
When needing gearshift; Cancellation earlier is in the location of the intermediate gear of engagement; Promote corresponding jack shaft then forward or afterwards; Make the intermediate gear on this jack shaft move, finally make intermediate gear move to the location, engaging position, and be meshed with corresponding input gear and output gear towards input, output gear; Because the center line of intermediate gear and the shaft axis of input shaft parallel; Thereby cause center line and the input of intermediate gear, the center line of output gear to parallel; Cause intermediate gear through moving radially and input, output gear engagement; This engagement system realizes that through axial slip the mode of shifting gears is different fully with conventional construction, and intermediate gear and input, output gear are exactly that whole tooth surface meshes when just having begun to mesh.In addition, the present invention can come forward or back promotion corresponding jack shaft, for example manually operated type, hydraulic type, mechanical type, electric or integrated type through multiple structural type.
In the shift process, there are two groups of gears to be in engagement simultaneously.Owing to have linear differential between each gear, the intermediate gear that at this moment is cancelled the location can leave the engaging position of oneself under the promotion of on-line velocity difference automatically, thereby disengages with corresponding input gear and output gear, finally successfully realizes gearshift; And; Linear differential serves as the power of cancellation engagement in the present invention; Linear differential causes transmission to stop even biting teeth broken different fully in this and the conventional construction; Original drawback is become present benefit, and this has also solved related domain technical barrier for a long time, and those skilled in the art are not easy to expect especially.
Adopt above structure, the present invention moves radially through gear, and the linear differential between the different gears of ingenious utilization is simultaneously accomplished gearshift; This realizes that through the gear axial slip gearshift is different fully with conventional construction; And can avoid conventional construction well owing to exist linear differential to be prone to the defective that transmission stops even biting broken teeth between the different gears, and be skillfully constructed, simple in structure; Be easy to make, be suitable for extensively promoting the use in the gear graduation field.
Said first, second and third jack shaft offers containing groove by after going on (10,11,12) respectively, and this containing groove is the groove that runs through each jack shaft left and right surfaces; The middle part of said first, second and third intermediate gear (13,14,15) is contained in respectively in the corresponding containing groove; Left and right of each intermediate gear is all exposed outside the containing groove; And left and right of each intermediate gear is all exposed outside the containing groove; And each intermediate gear is empty respectively to be enclosed within on the corresponding installation shaft (16), and the upper and lower end of this installation shaft is located in the mounting hole on the corresponding jack shaft respectively.
Above structure not only can be installed each intermediate gear securely; And each intermediate gear is rotated on jack shaft neatly, and forward and backward when mobile at each jack shaft, the intermediate gear that drives above it is meshed with corresponding input gear and output gear; And simple in structure, make easily.
The anterior mounting hole that inserts on the preceding casing of casing (1) of said first, second and third jack shaft (10,11,12) is a blind hole, and is respectively first, second and third preceding mounting hole (1a, 1c, 1e); The mounting hole on casing (1) rear box is also inserted at the rear portion of said first, second and third jack shaft (10,11,12) respectively; This mounting hole also is a blind hole; And be respectively first, second and third back mounting hole (1b, 1d, 1f), and first, second and third jack shaft (10,11,12) axle body of front and rear portions closely contacts with the hole wall of each said mounting hole.
Adopt above structure; The present invention both can go up corresponding mounting hole with casing (1) and be used for installing each jack shaft; Can jack shaft and the corresponding mounting hole of this jack shaft front and rear portions be used as complete oil cylinder together again; So that in mounting hole, inject hydraulic oil through external hydraulic pipe line, and it is forward and backward mobile to promote each jack shaft through hydraulic oil, so that realize gearshift.
As another structural type of the present invention; The mounting hole that insert on the preceding casing of casing (1) front portion of said first, second and third jack shaft (10,11,12) is a blind hole; And be respectively first, second and third preceding mounting hole (1a, 1c, 1e), and the anterior axle body of first, second and third jack shaft (10,11,12) closely contacts with the hole wall of each said mounting hole; The rear portion of said first, second and third jack shaft (10,11,12) is unsettled; And said first intermediate gear (13) is installed at the free end of first jack shaft; The free end of second jack shaft (11) is installed said second intermediate gear (14), and the free end of the 3rd jack shaft (12) is installed said the 3rd intermediate gear (15).
Promote the forward and backward first kind of mobile hydraulic pipe line structure of each jack shaft as the present invention, said input shaft (2) links to each other with main oil pump (17), and drives this main oil pump work; The filler opening of the oil outlet of said main oil pump (17) and control valve (18) joins; This control valve has three oil outlets; Wherein first oil outlet through oil inlet pipe (19) and said first before filler opening at the bottom of mounting hole (1a) hole is communicated with, the oil outlet on this first preceding mounting hole hole wall passes through first return tube (20) and is communicated with oil groove;
Second oil outlet of said control valve (18) is communicated with the oil-feed arm of first three-way pipe (21); Two of this first three-way pipe (21) go out oil inlet pipe and are communicated with filler opening at the bottom of the said second forward and backward mounting hole (1c, the 1d) hole respectively; Oil outlet on this second forward and backward mounting hole (1c, 1d) hole wall is communicated with oil groove through the corresponding second forward and backward return tube (22,23) respectively, and the distance at the bottom of preceding mounting hole (1c) hole of return tube (22) filler opening to the second equals the distance at the bottom of mounting hole (1d) hole, return tube (23) filler opening to the second back after second before second;
The 3rd oil outlet of said control valve (18) is communicated with the oil-feed arm of second three-way pipe (24); Two of this second three-way pipe (24) go out oil inlet pipe and are communicated with filler opening at the bottom of the said the 3rd forward and backward mounting hole (1e, the 1f) hole respectively; Oil outlet on the 3rd forward and backward mounting hole (1e, the 1f) hole wall is communicated with oil groove through corresponding the 3rd forward and backward return tube (25,26) respectively, and the distance at the bottom of return tube (25) filler opening to the three preceding mounting hole (1e) holes equals the distance at the bottom of mounting hole (1f) hole, return tube (26) filler opening to the three back after the 3rd before the 3rd.
When adding the retaining operation; Input shaft (2) rotation drives said main oil pump (17) work; The filler opening of control valve this moment (18) is communicated with its first oil outlet, and the hydraulic oil of main oil pump (17) output flows to the inner chamber of mounting hole (1a) before said first through control valve (18) and oil inlet pipe (19).When the hydraulic oil in injecting the first preceding mounting hole (1a) did not reach and promotes the required pressure of first jack shaft (10), this gear was in the neutral state; After the hydraulic oil in the mounting hole (1a) before the injection first surpasses the required force value of design; First intermediate gear (13) that promotes on first jack shaft (10) and this first jack shaft (10) moves backward; Finally make first intermediate gear (13) be positioned at the engaging position; And be meshed with first input gear (4) and first output gear (7), this moment, this gear was in a retaining state, thereby made output shaft (3) rotation; And mounting hole (1a) inner chamber is communicated with oil groove through first return tube (20) simultaneously before first, thereby the hydraulic oil in the first preceding mounting hole (1a) is got back in the oil groove through first return tube (20).
When the rotating speed of input shaft (2) improves; The hydraulic fluid pressure that gets in control valve (18) control oil channel improves; After the pressure of hydraulic oil in the control oil channel reaches setting value; The spring force that the spool of control valve (18) overcomes this control valve (18) moves to high gear, and then the filler opening of control valve (18) is communicated with second oil outlet of this control valve (18), and the filler opening of control valve (18) and its first oil outlet break off.The hydraulic oil of said main oil pump (17) output two through control valve (18) and first three-way pipe (21) go out the oil inlet pipe back injection hydraulic oil in the mounting hole (1d) of mounting hole (1c) and second before second respectively; Because the distance before second at the bottom of preceding mounting hole (1c) hole of return tube (22) filler opening to the second equals the distance at the bottom of mounting hole (1d) hole, return tube (23) filler opening to the second back, second back; Move backward with regard to making the hydraulic oil that injects in the second preceding mounting hole (1c) promote second jack shaft (11) like this; The hydraulic oil that injects in the second back mounting hole (1d) is then directly got back to oil groove through the said second back return tube (23); Second jack shaft (11) is final under the promotion of hydraulic oil in the mounting hole (1c) before second to get into the location, engaging position, thereby second intermediate gear (14) on second jack shaft (11) is meshed with the second input gear (5) and second output gear (8).At this moment; The gear train of the gear train of one retaining and two retainings is in engagement simultaneously; Will have speed difference between each gear like this, and the linear velocity of second intermediate gear because moving first intermediate gear that drives a retaining state to high tap position, the spool of control valve 18 is cancelled the location again greater than the linear velocity of first intermediate gear; Second intermediate gear of two retaining states then is positioned; So just make the intermediate gear of winning (13) under the drive of speed difference, be pushed to the place ahead of the first input gear (4), and break away from, add the two retaining states that keep off into thereby this gear is kept off by one with first input gear (4) and first output gear (7).
This gear two retaining adds the working principle of keeping off into three retainings and a retaining and becomes two and keep off basic identically, does not do at this and to give unnecessary details.
Simultaneously, the working principle that subtracts retaining is with to add retaining roughly close, do not do at this and gives unnecessary details.What pay particular attention to is: when this gear subtracts into two retainings by three retainings; Because the 3rd intermediate gear linear velocity of three retaining states correspondence is greater than the second corresponding intermediate gear linear velocity of two retaining states, the drive of the 3rd intermediate gear on-line velocity difference is moved to the rear of the 3rd input gear.Therefore, this gear next time moves forward under the drive of the 3rd intermediate gear hydraulic oil in the 3rd back mounting hole during by two retaining additions, three retainings, so with the 3rd input gear and the engagement of the 3rd output gear.
By on can find out, second and third intermediate gear in the present embodiment to front or rear when mobile can with corresponding input gear and output gear engagement, and first intermediate gear has only and moves backward and could mesh with output gear with corresponding input gear.In addition, this hydraulic pipe line structure is applicable to the occasion that input is more stable, on lathe.
In first kind of hydraulic structure, in the said first back mounting hole (1b) first damping spring (27) is housed, contact the back end in contact of its front end and said first jack shaft (10) at the bottom of the hole of mounting hole (1b) behind the rear end of this first damping spring and first.
Because the first input gear, first intermediate gear and first output gear rigidly connect when touching and can produce certain impact; Adopt first damping spring (27) just can play buffer function; Prevent that better the first input gear, first intermediate gear and first output gear from being broken, and then guarantee the working life of each gear.
Promote the forward and backward second kind of mobile hydraulic pipe line structure of each jack shaft as the present invention, said input shaft (2) links to each other with main oil pump (17), and drives this main oil pump work; The filler opening of the oil outlet end of said main oil pump (17) and regulating and controlling valve (28) joins, and the control oil channel of this regulating and controlling valve links to each other with control oil pump (34), and this control oil pump (34) links to each other with said output shaft (3), and is driven by output shaft (3); Said regulating and controlling valve (28) has three oil outlets; Wherein first oil outlet is communicated with the oil-feed arm of the 3rd three-way pipe (29); The filler opening that first of the 3rd three-way pipe (29) goes out at the bottom of the oil inlet pipe and said first preceding mounting hole (1a) hole is communicated with, and the oil outlet on first preceding mounting hole (1a) hole wall is communicated with oil groove through first return tube (20); The filler opening that second of said the 3rd three-way pipe (29) goes out at the bottom of the oil inlet pipe and said second back mounting hole (1d) hole is communicated with;
The oil-feed arm of second oil outlet of said regulating and controlling valve (28) and the 4th three-way pipe (31) joins; The filler opening that first of the 4th three-way pipe (31) goes out at the bottom of the oil inlet pipe and said second preceding mounting hole (1c) hole is communicated with, and the oil outlet on second preceding mounting hole (1c) hole wall is communicated with oil groove through the second preceding return tube (22); The filler opening that second of said the 4th three-way pipe (31) goes out at the bottom of oil inlet pipe and the said the 3rd back mounting hole (1f) hole is communicated with;
The 3rd oil outlet of said regulating and controlling valve (28) through inflow pipeline (33) and the said the 3rd before filler opening at the bottom of mounting hole (1e) hole join, the oil outlet before the 3rd on mounting hole (1e) hole wall is communicated with oil groove through return tube (25) before the 3rd; The control oil channel of said regulating and controlling valve (28) links to each other with control oil pump (34), and this control oil pump (34) links to each other with said output shaft (3), and is driven by output shaft (3).
It is basic identical with the working principle and the embodiment 1 that subtract retaining that present embodiment adds retaining, do not do at this and give unnecessary details.In addition, this hydraulic pipe line structure is applicable to that input is not very stable occasion, on vehicle.
In second kind of hydraulic structure; In the said first back mounting hole (1b) first damping spring (27) is housed; In the second back mounting hole (1d) second damping spring (35) is housed; In the 3rd back mounting hole (1f) the 3rd damping spring (36) is housed, the rear end of these three damping springs respectively with corresponding after contact at the bottom of the hole of mounting hole (1b and 1d and 1f), the front end of these three damping springs then respectively with the back end in contact of corresponding jack shaft.
Because first input, middle, output gear and second input, middle, output gear and the 3rd input, middle, output gear rigidly connect when touching and can produce certain impact; Adopt first damping spring (27), second damping spring (35) and the 3rd damping spring (36) just can play buffer function; Prevent that better each gear from being broken, and then guarantee the working life of each gear.
Beneficial effect: the present invention moves radially through gear; And simultaneously the linear differential between the different gears of ingenious utilization is accomplished gearshift, and this realizes that through the gear axial slip gearshift is different fully with conventional construction, and can avoid conventional construction to exist linear differential to be prone to the defective that transmission stops even biting broken teeth owing between the different gears well; And be skillfully constructed; Simple in structure, be easy to make, be suitable for extensively promoting the use in the gear graduation field.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is that the A-A of Fig. 1 is to sectional view;
Fig. 3 is embodiment 1 a hydraulic pipe line schematic representation;
Fig. 4 is embodiment 2 a hydraulic pipe line schematic representation;
Fig. 5 is embodiment 3 a structural representation.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further:
Like Fig. 1, shown in 2 and 3; Present embodiment mainly is made up of return tube 25, the 3rd back return tube 26 and first damping spring 27 before return tube before gearbox 1, input shaft 2, output shaft 3, the first input gear 4, the second input gear 5, the 3rd input gear 6, first output gear 7, second output gear 8, the 3rd output gear 9, first jack shaft 10, second jack shaft 11, the 3rd jack shaft 12, first intermediate gear 13, second intermediate gear 14, the 3rd intermediate gear 15, installation shaft 16, oil pump 17, control valve 18, oil inlet pipe 19, first return tube 20, first three-way pipe 21, second 22, the second back return tube 23, second three-way pipe 24, the 3rd; Wherein vertically be provided with input shaft 2 and output shaft 3 in the gearbox 1; The upper and lower end of these two axles is supported on the gearbox 1 through bearing (not marking among the figure) respectively; And input shaft 2 rotates under the drive of external power, and input shaft 2 rotates through gear driven output shaft 3.Simultaneously, on input shaft 2, be installed with the said first input gear 4, the second input gear 5 and the 3rd input gear 6 from top to bottom successively, and the diameter of the first input gear 4, the second input gear 5 and the 3rd input gear 6 increases successively.On the said output shaft 3 to should first input gear 4, the second input gear 5 and the 3rd input gear 6 be installed with first output gear 7, second output gear 8 and the 3rd output gear 9, and the diameter of first output gear 7, second output gear 8 and the 3rd output gear 9 reduces successively.
As improvement of the present invention; Between said input shaft 2 and output shaft 3, be arranged side by side three jack shafts; Be followed successively by first jack shaft 10, second jack shaft 11 and the 3rd jack shaft 12 from top to bottom, this first jack shaft 10, second jack shaft 11 and the 3rd jack shaft 12 are all perpendicular with said input shaft 2 and output shaft 3.Insert before the said gearbox 1 in the mounting hole corresponding on the casing respectively the front portion of said first jack shaft 10, second jack shaft 11 and the 3rd jack shaft 12, and insert in the mounting hole corresponding on said gearbox 1 rear box respectively at the rear portion of this first jack shaft 10, second jack shaft 11 and the 3rd jack shaft 12.As preferably, said first jack shaft 10, second jack shaft 11 and the 3rd jack shaft 12 anterior mounting holes that insert on the casings 1 are blind hole, and mounting hole 1e before the mounting hole 1c and the 3rd before the mounting hole 1a, second before being respectively first.The mounting hole that insert on the casing 1 at above-mentioned first jack shaft 10, second jack shaft 11 and the 3rd jack shaft 12 rear portions also is a blind hole; And be respectively the first back mounting hole 1b, the second back mounting hole 1d and the 3rd back mounting hole 1f; And the axle body of first jack shaft 10, second jack shaft 11 and the 3rd jack shaft 12 front and rears closely contacts with the hole wall of each said mounting hole; And first jack shaft 10, second jack shaft 11 and the 3rd jack shaft 12 can slide in each mounting hole, so just can make corresponding preceding mounting hole of jack shaft and this jack shaft and back mounting hole constitute a complete oil cylinder together.
Can find out that from Fig. 1,2 and 3 on said first jack shaft 10, be equipped with and first input gear 4 and first output gear 7, first intermediate gear 13 of combo mutually, the gears that this first intermediate gear 13 and first is imported gear 4, first output gear, 7 correspondences are a retaining.On second jack shaft 11, be equipped with said second and import gear 5, second output gear 8 second intermediate gear 14 of combo mutually, this second intermediate gear 14 and second is imported gear 5, second output gear, 8 corresponding gears are two retainings.Be equipped with on said the 3rd jack shaft 12 that the 3rd intermediate gear 15, the three intermediate gears 15 of combo and the gears of the 3rd input gear 6, the 3rd output gear 9 correspondences are three retainings mutually with the 3rd input gear 6, the 3rd output gear 9.
As optimization, said first jack shaft 10, second jack shaft 11, the 3rd jack shaft 12 offer containing groove respectively, and this containing groove is offered after going to again, and containing groove is the groove that runs through each jack shaft left surface and right surface.The middle part of said first intermediate gear 13, second intermediate gear 14 and the 3rd intermediate gear 15 is contained in respectively in the corresponding containing groove; The left part of this first intermediate gear 13, second intermediate gear 14 and the 3rd intermediate gear 15 and right part expose outside the corresponding containing groove respectively, so that mesh with each self-corresponding input gear and output gear.
Also can find out from Fig. 1,2 and 3; The center line of said first intermediate gear 13, second intermediate gear 14 and the 3rd intermediate gear 15 all parallels with the shaft axis of said input shaft; And each intermediate gear is empty respectively to be enclosed within on the corresponding installation shaft 16, and the top and bottom of this installation shaft 16 are located in the mounting hole on the corresponding jack shaft respectively.And said first jack shaft 10, second jack shaft 11 and the 3rd jack shaft 12 can forward and backwardly move under the effect of external force, and then make intermediate gear and corresponding input gear and output gear engagement on each jack shaft.In the present embodiment, the centre distance of input shaft 2 and output shaft 3 is provided with enough greatly, so that let first intermediate gear 13, second intermediate gear 14 and the 3rd intermediate gear 15 move the forward and backward side of input shaft 2 and output shaft 3.In addition, above-mentioned external force can be manpower, can be hydraulic coupling, also can be mechanical force
Also can further find out from Fig. 1,2 and 3; As a kind of hydraulic pipe line structure of the present invention; Said input shaft 2 links to each other with main oil pump 17, and drives this main oil pump 17 work, in pipeline, injects hydraulic oil; And input shaft 2 is well known to those skilled in the art with the linkage structure of main oil pump 17, does not do at this and gives unnecessary details.
Said control valve 18 is an outsourcing piece; This control valve 18 has a filler opening and three oil outlets; Its spool moves under the acting in conjunction of control oil channel and spring; Realize being communicated with and disconnection of filler opening and certain oil outlet, and the concrete structure of control valve 18 is conventionally known to one of skill in the art, do not do at this and give unnecessary details.
The oil outlet of the filler opening of said control valve 18 and main oil pump 17 joins; The filler opening that first oil outlet of this control valve 18 passes through at the bottom of the said oil inlet pipe 19 and the first preceding mounting hole 1a hole is communicated with, so that the hydraulic oil of main oil pump 17 outputs is got in the inner chamber of the first preceding mounting hole 1a through oil inlet pipe 19.In addition, the oil outlet on the above-mentioned first preceding mounting hole 1a hole wall is communicated with oil groove through first return tube 20, so just makes the hydraulic oil that injects mounting hole 1a inner chamber before first get back to oil groove through first return tube 20.In the said first back mounting hole 1b first damping spring 27 is housed, contacts the back end in contact of the front end of first damping spring 27 and said first jack shaft 10 at the bottom of the hole of mounting hole 1b behind the rear end of this first damping spring 27 and first.
Also can find out at last from Fig. 1,2 and 3; Second oil outlet of said control valve 18 is communicated with the oil-feed arm of first three-way pipe 21; One of this first three-way pipe 21 goes out that the filler opening at the bottom of the mounting hole 1c hole is communicated with before oil inlet pipe and said second, this before second the oil outlet on mounting hole 1c hole wall be communicated with oil groove through the second preceding return tube 22.The filler opening that another of said first three-way pipe 21 goes out at the bottom of the oil inlet pipe and the second back mounting hole 1d hole is communicated with, and the oil outlet on this second back mounting hole 1d hole wall is communicated with oil groove through the second back return tube 23.Distance before said second at the bottom of the preceding mounting hole 1c hole of return tube 22 filler openings to the second equals the distance at the bottom of the mounting hole 1d hole, return tube 23 filler openings to the second back, second back.
The 3rd oil outlet of said control valve 18 is communicated with the oil-feed arm of second three-way pipe 24; One of this second three-way pipe 24 goes out that the filler opening at the bottom of the mounting hole 1e hole is communicated with before oil inlet pipe and the said the 3rd, and the oil outlet before the 3rd on the mounting hole 1e hole wall is communicated with oil groove through the 3rd preceding return tube 25.The filler opening that another of said second three-way pipe 24 goes out at the bottom of oil inlet pipe and the said the 3rd back mounting hole 1f hole is communicated with, and the oil outlet on the 3rd back mounting hole 1f hole wall is communicated with oil groove through the 3rd back return tube 26.And the distance before the said the 3rd preceding return tube 25 filler openings to the three at the bottom of the mounting hole 1e holes equals the distance at the bottom of the mounting hole 1f hole, the 3rd back return tube 26 filler openings to the, three back.
The working principle of present embodiment hydraulic part is following:
When adding the retaining operation, input shaft 2 rotations drive said main oil pump 17 work, and this moment, the filler opening of control valve 18 was communicated with its first oil outlet, and the hydraulic oil of main oil pump 17 outputs flows to the inner chamber of mounting hole 1a before said first through control valve 18 and oil inlet pipe 19.When the hydraulic oil in injecting the first preceding mounting hole 1a did not reach and promotes first jack shaft, 10 required pressure, this gear was in the neutral state; After the hydraulic oil in the mounting hole 1a before the injection first surpasses the required force value of design; First intermediate gear 13 that promotes on first jack shaft 10 and this first jack shaft 10 moves backward; Finally make first intermediate gear 13 be positioned at the engaging position; And be meshed with first input gear 4 and first output gear 7, this moment, this gear was in a retaining state, thereby made output shaft 3 rotations; And mounting hole 1a inner chamber is communicated with oil groove through first return tube 20 simultaneously before first, thereby the hydraulic oil in the first preceding mounting hole 1a is got back in the oil groove through first return tube 20.
When the rotating speed of input shaft 2 improves; The hydraulic fluid pressure that gets in control valve 18 control oil channel improves; After the pressure of hydraulic oil in the control oil channel reaches setting value; The spring force that the spool of control valve 18 overcomes this control valve 18 moves to high gear, and then the filler opening of control valve 18 is communicated with second oil outlet of this control valve 18, and the filler opening of control valve 18 and its first oil outlet break off.The hydraulic oil of said main oil pump 17 outputs two through control valve 18 and first three-way pipe 21 go out oil inlet pipe respectively before second mounting hole 1c and second afterwards inject hydraulic oil in the mounting hole 1d; Because the distance before second at the bottom of the preceding mounting hole 1c hole of return tube 22 filler openings to the second equals the distance at the bottom of the mounting hole 1d hole, return tube 23 filler openings to the second back, second back; Move backward with regard to making the hydraulic oil that injects in the second preceding mounting hole 1c promote second jack shaft 11 like this; The hydraulic oil that injects in the second back mounting hole 1d is then directly got back to oil groove through the said second back return tube 23; Second jack shaft 11 is final under the promotion of hydraulic oil in the mounting hole 1c before second to get into the location, engaging position, thereby second intermediate gear 14 on second jack shaft 11 is meshed with the second input gear 5 and second output gear 8.At this moment; The gear train of the gear train of one retaining and two retainings is in engagement simultaneously; Will have speed difference between each gear like this, and the linear velocity of second intermediate gear because moving first intermediate gear that drives a retaining state to high tap position, the spool of control valve 18 is cancelled the location again greater than the linear velocity of first intermediate gear; Second intermediate gear of two retaining states then is positioned; So just make the intermediate gear 13 of winning under the drive of speed difference, be pushed to the place ahead of the first input gear 4, and break away from first output gear 7, add the two retaining states that keep off into thereby this gear is kept off by one with the first input gear 4.
This gear is added the working principle of keeping off into three retainings and a retaining and becomes two and keep off basic identically by two retainings, do not do at this and to give unnecessary details.
Simultaneously, present embodiment subtracts the working principle of retaining and adds retaining roughly close, does not do at this and gives unnecessary details.What pay particular attention to is: when this gear subtracts into two retainings by three retainings; Because the 3rd intermediate gear 15 linear velocities of three retaining states correspondence are greater than corresponding second intermediate gear, 14 linear velocities of two retaining states, the drive of the 3rd intermediate gear 15 on-line velocity differences is moved to the rear of the 3rd input gear 6.Therefore, this gear next time moves forward under the drive of the 3rd intermediate gear 15 hydraulic oil in the 3rd back mounting hole 1f, and then meshes with the 3rd input gear 6 and the 3rd output gear 9 during by two retaining additions, three retainings.
By on can find out; Second intermediate gear 14 in the present embodiment and the 3rd intermediate gear 15 to front or rear when mobile can with corresponding input gear and output gear engagement, and first intermediate gear 13 has only and moves backward and could mesh with output gear with corresponding input gear.
With reference to Fig. 1,2 and 3, and combine Fig. 4 to draw, in the present embodiment; Said input shaft 2 links to each other with main oil pump 17, and drives this main oil pump 17 work, in pipeline, injects hydraulic oil; And input shaft 2 is well known to those skilled in the art with the linkage structure of main oil pump 17, does not do at this and gives unnecessary details.Said regulating and controlling valve 28 is an outsourcing piece, and it has a filler opening and three oil outlets, and its spool moves under the acting in conjunction of control oil channel and spring, and the realization filler opening is communicated with and disconnection with certain oil outlet.And; The control oil channel of regulating and controlling valve 28 links to each other with control oil pump 34, and this control oil pump 34 links to each other with said output shaft 3, and is driven by output shaft 3; And output shaft 3 is well known to those skilled in the art with the linkage structure of control oil pump 34, does not also do at this and gives unnecessary details.In addition, the concrete structure of regulating and controlling valve 28 is conventionally known to one of skill in the art, does not do at this and gives unnecessary details.
The oil outlet end of the filler opening of said regulating and controlling valve 28 and main oil pump 17 joins, and first oil outlet of this regulating and controlling valve 28 is communicated with the oil-feed arm of said the 3rd three-way pipe 29.The filler opening that first of above-mentioned the 3rd three-way pipe 29 goes out at the bottom of the oil inlet pipe and the said first preceding mounting hole 1a hole is communicated with, and the oil outlet on the first preceding mounting hole 1a hole wall is communicated with oil groove through first return tube 20.The filler opening that second of said the 3rd three-way pipe 29 goes out at the bottom of the oil inlet pipe and the said second back mounting hole 1d hole is communicated with.
With reference to Fig. 1,2 and 3; And combine Fig. 4 further to draw; The oil-feed arm of second oil outlet of said regulating and controlling valve 28 and the 4th three-way pipe 31 joins; The filler opening that first of the 4th three-way pipe 31 goes out at the bottom of the oil inlet pipe and the said second preceding mounting hole 1c hole is communicated with, and the oil outlet on the second preceding mounting hole 1c hole wall is communicated with oil groove through the said second preceding return tube 22.The filler opening that second of said the 4th three-way pipe 31 goes out at the bottom of oil inlet pipe and the said the 3rd back mounting hole 1f hole is communicated with.
The 3rd oil outlet of said regulating and controlling valve 28 through inflow pipeline 33 and the said the 3rd before filler opening at the bottom of the mounting hole 1e hole join, the oil outlet before the 3rd on the mounting hole 1e hole wall is communicated with oil groove through return tube 25 before the said the 3rd.
As optimization, be equipped with in the said first back mounting hole 1b to be equipped with in second damping spring, 35, the three back mounting hole 1f in first damping spring, 27, the second back mounting hole 1d the 3rd damping spring 36 is housed.Wherein, contact the back end in contact of the front end of this first damping spring 27 and said first jack shaft 10 at the bottom of the hole of mounting hole 1b behind the rear end of said first damping spring 27 and first.Contact the back end in contact of the front end of this second damping spring 35 and second jack shaft 11 at the bottom of the hole of mounting hole 1d behind the rear end of said second damping spring 35 and second.Contact the back end in contact of the front end of the 3rd damping spring 36 and said the 3rd jack shaft 12 at the bottom of the hole of mounting hole 1f behind the rear end of said the 3rd damping spring 36 and the 3rd.In addition; In the present embodiment the centre distance of input shaft 2 and output shaft 3 be provided with just right; So that let first intermediate gear 13, second intermediate gear 14 and the 3rd intermediate gear 15 can not move to the rear of input shaft 2 and output shaft 3; All the other structures and the embodiment 1 of present embodiment are identical, do not do at this and give unnecessary details.
The working principle of present embodiment hydraulic part is following:
When adding the retaining operation; Input shaft 2 rotations drive said main oil pump 17 work; The filler opening of regulating and controlling valve 28 is communicated with first oil outlet of this regulating and controlling valve 28 at this moment; The hydraulic oil of main oil pump 17 output injects hydraulic oil through regulating and controlling valve 28 in the oil-feed arm of said the 3rd three-way pipe 29, and through the 3rd three-way pipe 29 two go out oil inlet pipe respectively to first before mounting hole 1a and second afterwards inject hydraulic oil in the mounting hole 1d.When the hydraulic oil in injecting the first preceding mounting hole 1a does not reach setting value, can not promote first jack shaft 10 backward, this gear is in the neutral state.When the hydraulic oil in injecting the first preceding mounting hole 1a reaches setting value, promote first jack shaft 10 and move backward, finally make first intermediate gear 13 and the first input gear 4 and 7 engagements of first output gear on first jack shaft 10; Promote second jack shaft 11 and move forward and inject hydraulic oil in the second back mounting hole 1d, second intermediate gear 14 and the second input gear 5 and second output gear 8 are broken away from, thereby make this gear be in a retaining state, and 3 rotations of drive output shaft.Simultaneously, this moment got back to oil groove through first return tube 20 by the hydraulic oil that injects in the first preceding mounting hole 1a.
When the load on the output shaft 3 surpasses setting value less than the rotating speed of the input power of input shaft 2 and output shaft 3; The control hydraulic oil of control oil pump 34 outputs makes the spool of regulating and controlling valve 28 overcome elastic force and moves to high gear; The filler opening of regulating and controlling valve 28 is communicated with its second oil outlet at this moment; And the filler opening of regulating and controlling valve 28 and its first oil outlet break off, and it is basic identical to keep off the working procedure and neutral change one retaining that become three retainings as for a concrete retaining change two retainings and two, do not do at this and give unnecessary details.
Present embodiment subtracts the working procedure when keeping off and adds retaining similar basically, does not also do at this and gives unnecessary details.And first jack shaft 10, second jack shaft 11 and the 3rd jack shaft 12 have only and move the intermediate gear that just can make above it backward and mesh with corresponding input gear and output gear.
With reference to Fig. 1,2,4, and combine Fig. 5 can find out that in the present embodiment, the rear portion of said first jack shaft 10 is unsettled, and adorn said first intermediate gear 13 at this free end.The rear portion of said second jack shaft 11 is unsettled, and adorns said second intermediate gear 14 at this free end.Empty behind the end of said the 3rd jack shaft 13, and adorn said the 3rd intermediate gear 15 at this free end.And the back of first on said casing 1 rear box mounting hole 1b, the second back mounting hole 1d and the 3rd back mounting hole 1f are on the shelf.In addition; In the present embodiment the centre distance of input shaft 2 and output shaft 3 be provided with just right; So that first intermediate gear 13, second intermediate gear 14 and the 3rd intermediate gear 15 can only be moved in the place ahead of input shaft 2 and output shaft 3; And can not pass the line of centres of input shaft 2 and output shaft 3, all the other structures and the embodiment 2 of present embodiment are identical, do not do at this and give unnecessary details.
Present embodiment add when retaining and embodiment 2 basic identical, do not do at this and to give unnecessary details.Present embodiment was kept to for 2 whens retaining by three retainings, need reduce the rotating speed of input shaft 2 earlier, had linear differential so that make the 3rd intermediate gear and the 3rd import gear, and then made under the drive of the 3rd intermediate gear on-line velocity difference and move forward.Present embodiment is kept to a retaining by two retainings working principle and three retainings are kept to two and keep off basic identically, also do not do at this and to give unnecessary details.
The above is merely preferred embodiment of the present invention, is not restriction with the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. gear shift; In gearbox (1), vertically be provided with input shaft (2) and output shaft (3); The upper and lower end of these two axles passes through bearings respectively on gearbox (1); On input shaft (2), be with first, second and third input gear (4,5,6) from top to bottom successively; And the diameter of first, second and third input gear increases successively; Said output shaft (3) is gone up should first, second and third output gear (7,8,9) being housed first, second and third input geared sleeve, it is characterized in that: between said input shaft (2) and output shaft (3), be arranged side by side three jack shafts, be followed successively by first, second and third jack shaft (10,11,12) from top to bottom; This first, second and third jack shaft is vertical with said input shaft (2), and insert in the mounting hole corresponding on the preceding casing of said gearbox (1) respectively the front portion of first, second and third jack shaft; On said first jack shaft (10), be equipped with and first input, output gear (4,7) first intermediate gear (13) of combo mutually; Be equipped with on second jack shaft (11) and said second input, output gear (5,8) second intermediate gear (14) of combo mutually, and be equipped with on the 3rd jack shaft (12) and said the 3rd input, output gear (6,9) the 3rd intermediate gear (15) of combo mutually; The center line of said first, second and third intermediate gear (13,14,15) all parallels with the shaft axis of said input shaft (2); Each intermediate gear can rotate on jack shaft separately; And first, second and third jack shaft (10,11,12) can forward and backwardly move under the effect of external force, and then makes intermediate gear and corresponding input gear and output gear engagement on each jack shaft.
2. gear shift according to claim 1 is characterized in that: said first, second and third jack shaft offers containing groove by after going on (10,11,12) respectively, and this containing groove is the groove that runs through each jack shaft left and right surfaces; The middle part of said first, second and third intermediate gear (13,14,15) is contained in respectively in the corresponding containing groove; Left and right of each intermediate gear is all exposed outside the containing groove; And each intermediate gear is empty respectively to be enclosed within on the corresponding installation shaft (16), and the upper and lower end of this installation shaft is located in the mounting hole on the corresponding jack shaft respectively.
3. gear shift according to claim 1 and 2; It is characterized in that: the anterior mounting hole that inserts on the preceding casing of casing (1) of said first, second and third jack shaft (10,11,12) is a blind hole, and is respectively first, second and third preceding mounting hole (1a, 1c, 1e); The mounting hole on casing (1) rear box is also inserted at the rear portion of said first, second and third jack shaft (10,11,12) respectively; This mounting hole also is a blind hole; And be respectively first, second and third back mounting hole (1b, 1d, 1f), and first, second and third jack shaft (10,11,12) axle body of front and rear portions closely contacts with the hole wall of each said mounting hole.
4. gear shift according to claim 1; It is characterized in that: the mounting hole that insert on the preceding casing of casing (1) front portion of said first, second and third jack shaft (10,11,12) is a blind hole; And be respectively first, second and third preceding mounting hole (1a, 1c, 1e), and the anterior axle body of first, second and third jack shaft (10,11,12) closely contacts with the hole wall of each said mounting hole; The rear portion of said first, second and third jack shaft (10,11,12) is unsettled; And said first intermediate gear (13) is installed at the free end of first jack shaft; The free end of second jack shaft (11) is installed said second intermediate gear (14), and the free end of the 3rd jack shaft (12) is installed said the 3rd intermediate gear (15).
5. gear shift according to claim 3 is characterized in that: said input shaft (2) links to each other with main oil pump (17), and drives this main oil pump work; The filler opening of the oil outlet of said main oil pump (17) and control valve (18) joins; This control valve has three oil outlets; Wherein first oil outlet through oil inlet pipe (19) and said first before filler opening at the bottom of mounting hole (1a) hole is communicated with, the oil outlet on this first preceding mounting hole hole wall passes through first return tube (20) and is communicated with oil groove;
Second oil outlet of said control valve (18) is communicated with the oil-feed arm of first three-way pipe (21); Two of this first three-way pipe (21) go out oil inlet pipe and are communicated with filler opening at the bottom of the said second forward and backward mounting hole (1c, the 1d) hole respectively; Oil outlet on this second forward and backward mounting hole (1c, 1d) hole wall is communicated with oil groove through the corresponding second forward and backward return tube (22,23) respectively, and the distance at the bottom of preceding mounting hole (1c) hole of return tube (22) filler opening to the second equals the distance at the bottom of mounting hole (1d) hole, return tube (23) filler opening to the second back after second before second;
The 3rd oil outlet of said control valve (18) is communicated with the oil-feed arm of second three-way pipe (24); Two of this second three-way pipe (24) go out oil inlet pipe and are communicated with filler opening at the bottom of the said the 3rd forward and backward mounting hole (1e, the 1f) hole respectively; Oil outlet on the 3rd forward and backward mounting hole (1e, the 1f) hole wall is communicated with oil groove through corresponding the 3rd forward and backward return tube (25,26) respectively, and the distance at the bottom of return tube (25) filler opening to the three preceding mounting hole (1e) holes equals the distance at the bottom of mounting hole (1f) hole, return tube (26) filler opening to the three back after the 3rd before the 3rd.
6. gear shift according to claim 5; It is characterized in that: in the said first back mounting hole (1b) first damping spring (27) is housed; Contact the back end in contact of its front end and said first jack shaft (10) at the bottom of the hole of mounting hole (1b) behind the rear end of this first damping spring and first.
7. gear shift according to claim 3 is characterized in that: said input shaft (2) links to each other with main oil pump (17), and drives this main oil pump work; The filler opening of the oil outlet end of said main oil pump (17) and regulating and controlling valve (28) joins, and the control oil channel of this regulating and controlling valve links to each other with control oil pump (34), and this control oil pump (34) links to each other with said output shaft (3), and is driven by output shaft (3); Said regulating and controlling valve (28) has three oil outlets; Wherein first oil outlet is communicated with the oil-feed arm of the 3rd three-way pipe (29); The filler opening that first of the 3rd three-way pipe (29) goes out at the bottom of the oil inlet pipe and said first preceding mounting hole (1a) hole is communicated with, and the oil outlet on first preceding mounting hole (1a) hole wall is communicated with oil groove through first return tube (20); The filler opening that second of said the 3rd three-way pipe (29) goes out at the bottom of the oil inlet pipe and said second back mounting hole (1d) hole is communicated with;
The oil-feed arm of second oil outlet of said regulating and controlling valve (28) and the 4th three-way pipe (31) joins; The filler opening that first of the 4th three-way pipe (31) goes out at the bottom of the oil inlet pipe and said second preceding mounting hole (1c) hole is communicated with, and the oil outlet on second preceding mounting hole (1c) hole wall is communicated with oil groove through the second preceding return tube (22); The filler opening that second of said the 4th three-way pipe (31) goes out at the bottom of oil inlet pipe and the said the 3rd back mounting hole (1f) hole is communicated with;
The 3rd oil outlet of said regulating and controlling valve (28) through inflow pipeline (33) and the said the 3rd before filler opening at the bottom of mounting hole (1e) hole join, the oil outlet before the 3rd on mounting hole (1e) hole wall is communicated with oil groove through return tube (25) before the 3rd.
8. gear shift according to claim 7; It is characterized in that: in the said first back mounting hole (1b) first damping spring (27) is housed; In the second back mounting hole (1d) second damping spring (35) is housed; In the 3rd back mounting hole (1f) the 3rd damping spring (36) is housed, the rear end of these three damping springs respectively with corresponding after contact at the bottom of the hole of mounting hole (1b and 1d and 1f), the front end of these three damping springs then respectively with the back end in contact of corresponding jack shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210183273.5A CN102678843B (en) | 2012-06-06 | 2012-06-06 | Gear transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210183273.5A CN102678843B (en) | 2012-06-06 | 2012-06-06 | Gear transmission |
Publications (2)
| Publication Number | Publication Date |
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| CN102678843A true CN102678843A (en) | 2012-09-19 |
| CN102678843B CN102678843B (en) | 2014-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210183273.5A Expired - Fee Related CN102678843B (en) | 2012-06-06 | 2012-06-06 | Gear transmission |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108644325A (en) * | 2018-07-16 | 2018-10-12 | 重庆卓格豪斯机械有限公司 | Gear-shifting device of mini-tiller |
| CN110617303A (en) * | 2019-10-09 | 2019-12-27 | 刘贵同 | Pressure action rotating device between elastic round wheels |
| CN112524210A (en) * | 2021-02-08 | 2021-03-19 | 万鑫精工(湖南)股份有限公司 | Speed reducer for crane and crane |
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| JPH0478360A (en) * | 1990-07-18 | 1992-03-12 | Kubota Corp | Transmission gear |
| US20030183028A1 (en) * | 2002-03-27 | 2003-10-02 | Hiromichi Shimaguchi | Automatic transmission |
| CN102003502A (en) * | 2010-12-13 | 2011-04-06 | 四川成都成工工程机械股份有限公司 | Power shift speed changer for engineering machinery |
| CN102434651A (en) * | 2011-08-31 | 2012-05-02 | 太原重工股份有限公司 | Gear box used for sizing mill chassis |
| CN202674189U (en) * | 2012-06-06 | 2013-01-16 | 陈军 | Gear speed-changing mechanism |
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2012
- 2012-06-06 CN CN201210183273.5A patent/CN102678843B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0478360A (en) * | 1990-07-18 | 1992-03-12 | Kubota Corp | Transmission gear |
| US20030183028A1 (en) * | 2002-03-27 | 2003-10-02 | Hiromichi Shimaguchi | Automatic transmission |
| CN102003502A (en) * | 2010-12-13 | 2011-04-06 | 四川成都成工工程机械股份有限公司 | Power shift speed changer for engineering machinery |
| CN102434651A (en) * | 2011-08-31 | 2012-05-02 | 太原重工股份有限公司 | Gear box used for sizing mill chassis |
| CN202674189U (en) * | 2012-06-06 | 2013-01-16 | 陈军 | Gear speed-changing mechanism |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108644325A (en) * | 2018-07-16 | 2018-10-12 | 重庆卓格豪斯机械有限公司 | Gear-shifting device of mini-tiller |
| CN110617303A (en) * | 2019-10-09 | 2019-12-27 | 刘贵同 | Pressure action rotating device between elastic round wheels |
| CN112524210A (en) * | 2021-02-08 | 2021-03-19 | 万鑫精工(湖南)股份有限公司 | Speed reducer for crane and crane |
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|---|---|
| CN102678843B (en) | 2014-07-02 |
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